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  • Articles  (5,844)
  • Springer  (5,436)
  • Thomas Telford  (333)
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  • 2020-2024  (136)
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  • 1970-1974  (5,237)
  • 1945-1949  (471)
  • Economics  (3,128)
  • Architecture, Civil Engineering, Surveying  (3,038)
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  • Articles  (5,844)
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Year
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  • 1
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    Papers in regional science 24 (1970), S. 6-21 
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  • 2
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    Papers in regional science 24 (1970), S. 24-37 
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  • 3
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    Papers in regional science 24 (1970), S. 39-45 
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    Papers in regional science 24 (1970), S. 84-101 
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    Papers in regional science 24 (1970), S. 103-125 
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    Papers in regional science 24 (1970), S. 47-81 
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    Papers in regional science 24 (1970), S. 140-155 
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    Papers in regional science 24 (1970), S. 127-138 
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  • 9
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    Papers in regional science 24 (1970), S. 157-162 
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    Papers in regional science 24 (1970), S. 163-170 
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    Papers in regional science 24 (1970), S. 171-181 
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  • 12
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    Papers in regional science 25 (1970), S. 6-31 
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  • 13
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    Papers in regional science 31 (1973), S. 50-71 
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  • 14
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    Papers in regional science 31 (1973), S. 94-124 
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    Papers in regional science 31 (1973), S. 83-92 
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    Papers in regional science 32 (1974), S. 203-212 
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    Topics: Geography , Economics
    Notes: Conclusion I have argued that the current thrust toward land use planning on an extensive scale is a significant movement. It appears to respond to real societal forces and has mustered a consensus, albeit one that appears to have serious internal conflicts. For planners and regional scientists, the creation of regional planning agencies offers more than the opportunity for jobs. We have argued for many years that we are developing theories and techniques that allow us to understand regional phenomena in ways that are pragmatic and useful. Some of us may have the opportunity to find out how real those claims are. Our future as organized professional groups may depend on the answer.
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    Papers in regional science 33 (1974), S. 13-31 
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  • 18
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    Papers in regional science 30 (1973), S. 7-13 
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  • 19
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    Papers in regional science 30 (1973), S. 113-139 
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    Papers in regional science 30 (1973), S. 159-182 
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    Notes: Conclusions The results show that the utility framework is consistent with the observed shopping and work-trip patterns in the Detroit Metropolitan Area. Specifically, they show that an entropy utility function (exponential resistance function) explains the data better than a gravity utility function (power resistance function). Tripmaking is influenced by the income and location of the individual. The low-income households made fewer trips than the higher income households which is most likely related to the lack of automobile availability particularly in a region like Detroit where public transportation is underdeveloped. Various suggestions have emerged for further research in spatial interaction.
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  • 21
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    Papers in regional science 25 (1970), S. 46-69 
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    Papers in regional science 25 (1970), S. 33-44 
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    Notes: Conclusion A modified Wicksell model has been used to explain optimal timing decisions concerning the development of land from a lower to a higher urban use. The analysis has shown that, within the context of the assumptions, the optimal date for development or redevelopment of urban land depends on (1) the discount rate applying in the real estate market, (2) the property tax rate, (3) the earnings in any interim use, and (4) the way in which the higest and best use of the land is expected to change in the future. The analysis has also shown that the mere presence of rises in the value of land awaiting development to a higher use should not automatically be interpreted as speculative gains; rather, an increase in the value of such land is inherent in the process of capitalization of future income. More properly, only "windfall" changes in the value of land, which arise because of imperfectly foreseen evens that affect future development potential, should be considered speculative gains.
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    Papers in regional science 25 (1970), S. 71-82 
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    Notes: Conclusion The result of this paper is to suggest that the Koopmans-Beckmann conclusion quoted earlier depends crucially on the indivisibility assumed in their model. But the efficiency of spatial competition is still an open question. It is possible that the introduction of further complications in this model would impair the efficiency of spatial competition. Possible complications are the introduction of a demand side, greater diversity of intermediate and final goods, factor substitution, and diversity of destinations for final goods. A model in which final goods were shipped to a household sector whose locations were determined by the model would embody many of these complications. And it would be valuable to examine the efficiency of spatial competition in such a model. There are still important problems yet to be solved concerning the efficiency of spatial markets.
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  • 24
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    Papers in regional science 27 (1971), S. 95-117 
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  • 25
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    Papers in regional science 27 (1971), S. 119-133 
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  • 26
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    Papers in regional science 27 (1971), S. 63-93 
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  • 27
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    Papers in regional science 27 (1971), S. 151-166 
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  • 28
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    Papers in regional science 27 (1971), S. 167-180 
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    Papers in regional science 27 (1971), S. 45-60 
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    Topics: Geography , Economics
    Notes: Summary This paper delves into a more explicit analysis of demand in space than has been undertaken heretofore. Utility theory is used to develop the concepts of spatial income-distribution effect, spatial-induced income effect, and spatial substitution effect, the effects on demand of changes or differences in location. Indifference curve analysis is employed to give a graphical interpretation to these concepts. The use of this general approach to demand in space makes it apparent that the usual assumption of uniform partial demand curves is logically inconsistent in a spatial context. An assumption of spatial homogeneity of general demand functions and of income distribution is found to imply (1) generally nonidentical partial demand curves at different points in space, and thus that the existence of the demand cone requires special conditions, (2) cases where purchases may rise with increasing distance from the mill, (3) the lack of independence among the ranges of different goods, and (4) nonuniformity in the size of ranges for a given good (a) sold at different centers and (b) sold in different directions from one center. Further work on this topic is indicated along the lines of loosening the many restrictions imposed during the analysis. Two-dimensional rather than the linear markets, discriminatory f.o.b. or equalized delivered pricing rather than nondiscriminatory f.o.b. pricing, and a transportation system with limited rather than ubiquitous access are some cases in point.
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    Papers in regional science 27 (1971), S. 136-150 
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    Notes: Some Tentative Conclusions Recepitulating the main tentative findings, it appears that multivariate analysis may be a useful tool for analyzing linkages existing in regional economies. The sample of input-output tables so far examined was far too small for any regularities to emerge. Nonetheless, the pervasiveness of links based on spatial proximity rather than technical affinity in the first subsystem falls in line with theoretical considerations and deserves careful attention. Other limitations inherent in the use of a fixed coefficients production function underlying an input-output table and the dependence of the results upon accidents of an industrial classification developed for other purposes, especially in the treatment of services, have already been mentioned. The results so far derived seem also to indicate that the rather frequent use of small, highly aggregated input-output tables for regional studies limits their usefulness. As far as multivariate analysis is concerned, the highest possible degree of detail would be required.
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    Papers in regional science 27 (1971), S. 182-193 
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  • 32
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    Papers in regional science 27 (1971), S. 195-227 
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    Papers in regional science 27 (1971), S. 229-245 
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    Papers in regional science 27 (1971), S. 247-256 
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    Papers in regional science 28 (1972), S. 5-36 
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    Papers in regional science 28 (1972), S. 49-80 
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    Papers in regional science 28 (1972), S. 37-47 
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    Papers in regional science 28 (1972), S. 109-110 
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    Papers in regional science 28 (1972), S. 81-107 
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    Papers in regional science 28 (1972), S. 145-166 
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    Papers in regional science 28 (1972), S. 131-143 
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    Papers in regional science 28 (1972), S. 181-187 
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    Papers in regional science 28 (1972), S. 111-129 
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    Topics: Geography , Economics
    Notes: Conclusion The strategy we have described to determine location patterns of central places on a plain of nonuniform population density is presented as merely one small step in the task of bringing geographic theory closer to reality. At a time when the claim can be made that other facets of the theory are equally well out of touch with reality, some will undoubtedly conclude that these other facets deserve prior attention. They include entrepreneurial behavior and consumer spatial behaviorin fact, the whole marketing system is so naively treated by “classical” theory. Aside from potential applications to central place work, the algorithm is applicable to many current spatial servicing problems. In this respect it may serve as a normative tool in spatial planning. It has further been suggested that only minor modifications are necessary to extend the range of applications from the present emphasis on distributing points to serve equal population-size areas to other cases where distance constraints are imposed for the farthest person to be serviced; or where people are voluntarily choosing service points according to a space-preference function; or where the number of people to be served varies with population density; or where areas encompassing equal travel-time limits or travel-cost limits are desired. In all such cases, the fundamental logic and strategy of manipulating a set of points to best represent a set of local interpoint distances are identical. It is at this level that the isomorphism with multidimensional scaling algorithms which provided the stimulus for this work is to be found.
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    Papers in regional science 28 (1972), S. 167-180 
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    Papers in regional science 28 (1972), S. 189-202 
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    Papers in regional science 28 (1972), S. 203-219 
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    Papers in regional science 29 (1972), S. 1-24 
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    Papers in regional science 29 (1972), S. 25-44 
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    Papers in regional science 28 (1972), S. 255-276 
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    Papers in regional science 29 (1972), S. 63-69 
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    Papers in regional science 29 (1972), S. 45-62 
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    Papers in regional science 29 (1972), S. 73-86 
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    Papers in regional science 29 (1972), S. 87-104 
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    Papers in regional science 29 (1972), S. 105-123 
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    Papers in regional science 29 (1972), S. 125-135 
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    Papers in regional science 29 (1972), S. 139-165 
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    Papers in regional science 29 (1972), S. 179-185 
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    Papers in regional science 29 (1972), S. 167-177 
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    Transportation 1 (1972), S. 29-54 
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    Notes: Abstract This paper explains the need for the application of cost-benefit analysis to the evaluation of alternative projects for investment in the transport field and outlines briefly the historical development of the technique. The results of a comparative survey of a number of cost-benefit studies which have been carried out in Britain and some conclusions as to their thoroughness and comprehensiveness (or otherwise) are presented. The article concludes with a number of specific and detailed recommendations to remedy apparent methodological weaknesses. Six of these recommendations seem to merit particular attention: (1) The viewpoint of most studies should be extended so as to avoid confinement, for example, within an arbitrary local government boundary, and a wider range of “externalities” should be considered. Intangibles should be included explicitly in all such evaluation exercises. (2) The actual incidence of costs and benefits should be examined in order to indicate the directional impact of the project and its implications in terms of equity. The elimination of transfer payments and double-counting should be postponed until the latest possible stage in the evaluation. (3) Equity considerations should be investigated in any transportation plan, since most projects have considerable equity implications for particular areas or socio-economic groups. (4) Discounted cash flow techniques, which are still used only in a minority of transportation studies, should become standard practice. Most evaluations are based on a single-year rate of return, or at best on simple trend forecasting. More resources should be devoted to proper evaluation of alternative plans which give due importance to the cost and benefit streams through time. (5) Sensitivity analysis should be used in all transportation evaluations. Knowledge of the impact of different assignments, shadow prices, and discount rates are essential information for any decisionmaker. (6) Last, but not least, much greater communication should exist between analyst and decisionmaker than has existed in the past.
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    Transportation 1 (1972), S. 1-27 
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    Notes: Abstract Officials at various levels around the world are getting increasingly worried about the growth in automobile ownership and all the associated environmental problems that this implies. Voices are often heard advocating the exclusion of automobiles from the central areas of cities, much easier to say than to realise, unless the area is entirely reconstructed under a comprehensive redevelopment scheme, as, for instance, in the city of Västeras, Sweden. Another possible solution is to introduce some type of traffic restraint scheme involving compulsory rearrangement of the vehicular flow through the central area. The report deals firstly with an experiment carried out during the highly intensive, pre-Christmas shopping days in December 1969, when parts of the central business area of the city of Gothenburg, Sweden (population around 450,000) were closed to all unauthorised vehicles. The experience gained with this scheme was valuable when the next stage was being planned, i.e., a permanent traffic restraint scheme which was put into effect on August 18, 1970. Most of the report deals with the objectives, planning, realisation, and experience of the traffic restraint scheme, which involved dividing the central business area into five separate zones. During the first six months, several surveys were conducted to establish the impact of the scheme on vehicular flow, parking, pedestrian flow, public transport, accidents, air pollution, noise, and retail businesses. The scheme put into operation in Gothenburg has been a great success, having accomplished most of its objectives, and will be expanded to cover a still larger area in subsequent years.
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    Transportation 3 (1974), S. 147-164 
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    Notes: Abstract The current process for allocating federal funds within the transportation sector of the U. S. is dominated by concerns for territorial equity, administrative feasibility, technical feasibility, and national defense. Economic efficiency as a long range objective is conspicuous by its absence except insofar as it is embodied in the desire to “promote the commerce” of the nation. Federal allocations for highways, waterways, and maritime subsidies are declining relative to urban public transit, and Coast Guard navigation related expenditures. Environmental considerations and obvious failure in the case of maritime subsidies appear to be the major reasons. Airport and airway allocations will be subject to the same negative forces. The next massive transportation program to appear in the federal budget other than urban public transit is likely to involve the national railway system. The big question here is how the money will be handed out. Economists and planners so far appear to have had little interest or impact in this difficult and crucial area of public decision making.
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    Transportation 3 (1974), S. 165-182 
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    Notes: Abstract The purpose of this paper is to discuss various types of behavioral data of potential relevance to transit planning. In particular a distinction is drawn between behavorial information regarding feelings, attitudes, opinions, and the like and more sophisticated types of data dealing with individuals' intentions to respond in certain ways given certain configurations of stimuli (transportation variables). The former is shown to be an important input to incremental planning, i.e., where information as to system performance is desired. The latter is shown to be critical to decisions regarding manipulations of transit system parameters, i.e., where knowledge of the outcome of manipulating system parameters is desired. A methodological example as to how the first type of data — informational level data — can be collected and utilized in system planning is presented. Specifically, data collected along the lines of traditional attitude surveys is collected in an attempt to monitor changes in public “satisfaction” with the Iowa City, Iowa, bus system before and after major system innovations. Implications of the collection and analytical procedures are discussed.
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    Transportation 3 (1974), S. 185-192 
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    Transportation 3 (1974), S. 243-254 
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    Notes: Abstract The analysis tests the utility of a simple regression approach in “postdictively” explaining transport development in West Malaysia from 1887 to 1968. The growth of the network is modelled as a process of contagious diffusion where transport densities of adjacent cells are used as predictor variables on a lagged basis. The partial regression coefficients provide measures of network orientation over time. The results demonstrate the importance of the contagion process in transport forecasting and provide equivalent levels of explanation when compared with a model which utilizes modernization indexes as predictor weights.
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    Transportation 3 (1974), S. 225-242 
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    Notes: Abstract There are two ways in which new road schemes may influence capital expenditure on vehicles. Firstly, by improving utilisation of existing vehicles, the size of fleet needed to perform a given volume of work may be reduced. This will clearly reduce the amount of capital tied up in motor vehicles at any point in time, and to the extent that vehicle life is determined by age rather than mileage run, will also yield savings in terms of investment in new vehicles. Secondly, by generating additional road traffic, road schemes may lead to an increase in the stock of vehicles in use. This paper argues that the current treatment of vehicle depreciation and interest charges in U.K. cost data fails to allow correctly for either of these items. Errors of logic occur in the way in which the capital stock of vehicles is valued, and in the fact that certain overheads are ignored even when fleet size changes. Moreover, the empirical evidence supporting the current partitioning of depreciation into overhead and running cost components, and the assumption of constant hours in service after an increase in journey speed seems of doubtful validity. An alternative method of calculating vehicle capital costs, based on the concept of annual capital charge, and making explicit the assumptions with respect to vehicle utilisation, is advocated, and the sensitivity of results to the view taken of the latter is demonstrated by means of specimen calculations.
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    Transportation 3 (1974), S. 289-310 
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    Notes: Abstract An experimental technique for exploring the sensitivity of transportation plan evaluations to forecasting and community value uncertainties is described. Three kinds of uncertainty — goal-achievement impacts, costs, and goal-weights — are included. Within a cost-effectiveness evaluation framework, an “on-line” capability for interactively and iteratively testing plan comparisons is outlined. A series of user-oriented computer instructions is developed to test plan comparison outcomes according to a wide variety of user-selected changes in impact forecasts, goal weights, and cost forecasts. A sample, hypothetical application of the technique is described. The technique is currently under further development by the San Diego Region Comprehensive Planning Organization.
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    Transportation 3 (1974), S. 323-334 
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    Notes: Abstract Evidence of the inability of transport models to elucidate policy is cited and reasons for this weakness are then suggested. Attention is drawn to the fundamental changes in both opinion and policy currently taking place. There is less concern with accessibility per se and rather more concern with the provision of adequate or minimum accessibility for certain social groups. More emphasis is placed also on the environmental aspects of transportation. The implications of these changes are outlined. It is not at all clear that the need to adapt and up-date models is appreciated widely enough. Finally, it is considered whether fundamental changes in methodology may help to make transport models more responsive to policy needs.
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    Transportation 3 (1974), S. 343-356 
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    Notes: Abstract This paper describes a disaggregate simultaneous destination and mode choice model for shopping trips. Following an introduction to the model structure and a review of the data, the results of five different model specifications are discussed. The models were estimated using data from two communities adjacent to Eindhoven, the Netherlands and utilise the multinomial logit model.
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    Transportation 2 (1973), S. 1-24 
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    Notes: Abstract Among the crises facing our society is the public's loss of confidence in technical professionals and their ability to make decisions about large-scale projects (such as highways) in the public interest. To overcome this crisis of confidence, this paper hypothesizes a model for the role of the technical professional in the process of reaching decisions about public actions. In evaluating technological projects with social consequences, one key issue is the differential incidence of impacts. Typically, some groups are hurt in order that others may benefit. Social equity must be considered explicitly. Such presently-used techniques as benefit-cost analysis and point-rating schemes are unsatisfactory. New techniques are needed, reflecting a more comprehensive model for the role of the technical team in the political process. A normative model is outlined. First, the objective of the technical process is defined: to achieve substantial effective community agreement on a course of action which is feasible, equitable, and desirable. Second, a process for achieving this objective is proposed. A key element of this process is a four-phase strategy of technical and community interaction activities to achieve the objective. The basic premise of this approach is that the role of the technical team is to clarify the issues of choice, to assist the community in determining what is best for itself. This theoretical model has resulted in several practical products. A procedural guide for use by highway and transportation agencies has been prepared, and a number of specific operational techniques have been developed and are included in the guide. The procedural guide is now being field-tested in several state highway departments. The theoretical model has already been useful in identifying, in one highway department, opportunities for significant changes in the agency's mission, organization and procedures to enable it to be more responsive to public concerns. The theoretical model also has served as the basis for the development of federal guidelines for consideration of social, economic and environmental factors in highway planning and decision-making, in all of the state highway departments in the U.S.
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    Transportation 2 (1973), S. 25-52 
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    Notes: Abstract This paper draws together empirical evidence from a variety of sources about the magnitudes of transit price elasticities and cross-elasticities. A number of different practical measures of demand elasticity are first defined and some expectations about magnitude are discussed. Evidence is then collated from the analysis of transit operating statistics, from experience in demonstration projects and from attempts to develop cross-sectional models of demand and modal choice. In general, all of the limited evidence available suggests that transit demand is inelastic with respect to money price. Typically, ridership is significantly more sensitive to changes in the level of service (particularly door-to-door journey time) than to changes in fare, although service elasticities also are usually numerically less than unity. In broad terms, short-run direct fare elasticities are characteristically observed to lie within the range of -0.1 to −0.7. A more precise value in a particular instance will depend on a variety of factors in ways which largely support a priori notions. Thus in very large cities, central city areas, at peak hours, and in other circumstances where the prices of alternative modes are high, transit fare elasticities are usually numerically at the lower end of the range. Estimates of cross-elasticities (representing the volumes of transit traffic diverted to other modes by transit price increases) are much harder to come by, and in fact only a few very uncertain estimates are presented here.
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    Transportation 2 (1973), S. 71-86 
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    Notes: Abstract Analysis of the results of past mass transit bond issues can aid transportation planners in understanding and anticipating voter behavior. This paper reports the results of an analysis of the 1968 rapid transit bond issue vote in Los Angeles, California. The simple relationships of the vote to a variety of possible explanatory variables are first examined. An attempt to assess the relative independent importance of these variables and to offer a partial explanation of the vote using multiple regression analysis is then presented. Variables found to have had the greatest impact on the vote are proximity to the proposed transit system, income-level, and ethnicity. Variables found to have had little or no effect, on the other hand, are population density, age, partisanship, and election turnout rate. The analysis indicates that the frequently used “mood-of-the-electorate” explanation of bond-issue failures in general, and transit proposals in particular, underestimates the quality of the electoral decision. The electorate does make rational distinctions, and future bonding attempts will confront voters capable of perceiving the utility to them of proposed transit systems and voting accordingly. The policy implications of this analysis suggest that the design of future mass transit proposals should, firstly more explicitly attempt to incorporate the preferences of middle-income voters, and secondly, be part of a comprehensive transit plan for the entire metropolitan area.
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    Transportation 1 (1972), S. i 
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    Transportation 1 (1972), S. 79-95 
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    Transportation 1 (1972), S. 69-78 
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    Transportation 1 (1972), S. 97-104 
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    Transportation 1 (1973), S. 475-475 
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    Transportation 1 (1973), S. 419-453 
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    Notes: Abstract Although the urban transportation planning process has evolved into the most sophisticated of all urban planning processes, the increasirig difficulty in implementing long-range transportation plans in urban areas today suggests basic questions concerning the process which deserve critical examination. Planning for implementation of urban transportation programs, particularly during periods of rapidly changing human values, requires a continuing re-evaluation of both technical and organizational strategies and their interrelationships. This paper raises some fundamental questions about the traditional activities and relationships that have characterized most urban transportation planning programs in the past. It also suggests a number of strategies, both technical and organizational, that may contribute to the implementation of plans and programs resulting from the transportation planning process. The first portion of this paper discusses the implications of not providing transportation services to match metropolitan growth. The experience of the Washington Metropolitan Area over the past decade is used to illustrate these implications. A discussion of organizational and institutional constraints upon the planning process follows. Then, the implications for the planning process are explored, and the scale of planning is reviewed as well as the need for monitoring the performance and impact of facilities. Next, the paper deals with the need to broaden the range of solutions to transportation problems, including consideration of economic and land development policies to reduce travel demand, as well as the provision of new facilities. Finally, techniques for involving decision-makers in the planning process are discussed. Examples of special project activities in the Washington area are used to illustrate these techniques and their value.
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    Transportation 3 (1974), S. 409-412 
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    Transportation 3 (1974), S. 413-423 
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    Transportation 2 (1973), S. 97-110 
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    Transportation 2 (1973), S. 111-117 
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    Transportation 2 (1973), S. 153-193 
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    Notes: Abstract Hypotheses are developed about the effects of telecommunication advances on urban growth patterns and urban travel demands. It is suggested that CBD (central business district) office employment might decentralize if telecommunications could effectively substitute for short inter-office business trips and that job decentralization would alter journey-to-work patterns and the viability of certain public transit systems. Major research questions are raised and keyed to an extensive bibliography.
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    Transportation 2 (1973), S. 313-319 
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    Notes: Abstract Over the last 15 years travel patterns were investigated in 15 urban settlements in Israel. The results indicate an unusual combination of high trip generation by dwelling unit and low motorization rates. The diversity of socio-economic characteristics of population groups, as well as that of city size distribution, are reflected both in motorization rates and in trip generation.
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    Transportation 2 (1973), S. 299-312 
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    Notes: Abstract This study examines variations in the basic parameter of the gravity model: the distance or travel time exponent. In a conceptual examination of the exponent under ideal conditions, it is noted that the exponent will be low if either production or consumption of the phenomena is geographically concentrated. It is further noted that if all regions produce and consume the phenomena, this generally implies a large number of substitute regions, and therefore a large exponent. These three variables are made operational and related to a set of eighty exponents for 1967 commodity flows in the United States. A multiple regression model is derived and utilized to estimate the exponents. The latter are then used to reestimate the flows. The root mean squared errors are quite similar for the fitted and estimated exponents. Implications of the research appear to be consistent with variations of the exponent in the urban context.
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    Transportation 2 (1973), S. 281-298 
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    Notes: Abstract The main line of the State Railway of Thailand to serve the Northeastern region of the Kingdom was built in 1900 to the town of Korat and subsequently extended to its northern extremity at the Laos border. The Friendship Highway, a modern highway parallel to the railway and serving the same transportation corridor, was completed in 1958 as far as Korat. In 1965 the northern extension of the Friendship Highway was opened to Nong Khai, the northern terminus of the railway. The effect of the nearby and parallel highway on freight traffic - for upland crops, vegetables, rice, kenaf, and forest products - is shown in terms of tonnages dispatched by the railway and in relation to the production of those commodities. Passenger traffic originating on the Northeastern railway line is analysed. Statistics indicating the shift in modal split between road and rail, for both freight and passengers in the Kingdom, are presented for a six-year period. An estimate of the loss in revenue for the Korat-Nong Khai segment of the railway has been made for both originating passengers and certain classes of freight traffic. Clearly demonstrated is the unceasing trend toward road haulage of freight and the use of highway buses by intercity passengers. This paper is intended to draw attention to the magnitude of the problem rather than to suggest definitive solutions.
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    Transportation 2 (1973), S. 337-339 
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    Transportation 2 (1973), S. 341-345 
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    Transportation 2 (1973), S. 347-349 
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    Transportation 2 (1973), S. 321-335 
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    Notes: Abstract Existing methods of evaluating large-scale transport networks involve the use of mathematical models of traffic flow which are generally both large and complex. However, the time and cost involved in the use of these models normally restricts their use for the detailed forecasting of traffic flows and costs to the assessment of a relatively small number of alternative patterns of overall investment. In order to evaluate the individual projects and groups of projects which go to make up an overall investment plan, it is, therefore, usually necessary to make simplifying assumptions about the influence of any one project on the overall traffic pattern, so as to isolate it from the influence of neighbouring projects. These assumptions generally result in the loss of a certain amount of the detail normally available from a standard model, and the task of assessing the relative value of different projects and the amount of interaction between them is made more difficult. This paper describes a new technique, designed to permit the evaluation of individual projects whilst still retaining the level of detail available from a full-scale mathematical model. The aim has been to produce a cheap and easy-to-use technique, capable of producing substantially the same results as a standard model. The technique uses newly developed computer algorithms which short-cut the full-scale model by forecasting the changes in an existing travel pattern resulting from the influence of a particular project. Initial tests suggest that approaching the problem in this way can save up to 70% of the computing time and costs involved in the use of a standard model for the evaluation of individual projects. The technique as described here is envisaged as a tool for aiding strategic investment decisions. It can, however, provide data for more detailed investigations, and could, with modifications, carry out these investigations on smaller problems than those for which it was originally designed.
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    Transportation 2 (1973), S. 373-389 
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    Notes: Abstract Two problems concerning the use of aerial photographs for conducting traffic studies in urban areas are considered in this paper: (1) Suitable procedures requiring simple equipment and methods and the appropriate formulae for determining the traffic characteristics of density, volume, traffic count, speed, composition; (2) Problems relating to flight planning for traffic surveys from the points of view of duration of photography and the scale of the photography from considerations of the reliability of the determined traffic characteristics, vehicle identification, and also economy. The conclusions concerning the flight planning were applied in a test flight from which traffic data were determined as illustrated in a sample calculation.
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    Transportation 2 (1973), S. 391-409 
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    Notes: Abstract In an effort to improve transit ridership prediction, this manuscript proposes a conceptually unique mode choice model derived from the field of experimental psychology. The “psychophysical“ model, as it is called, differs from earlier modal split models in its substantive use of psychological theory. The result is a modal split model with a sound behavioral foundation. The psychophysical model is tested using data from the recent demonstration of dial-a-bus in Columbia, Maryland and found to be a marginal predictor of modal split. It is noted though that the difference between actual and predicted ridership may be accounted for in a second generation model. This will employ individual rather than aggregate data, incorporate the concept of adaptation-level, and refine the decision-making process.
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    Transportation 2 (1973), S. 351-371 
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    Notes: Abstract An examination of current population statistics shows that in the U.S. more than half of the population is without immediate access to a car, and in the U.K. more than three-fifths of the population is without access to a car. This phenomenon has been accentuated by national investment in both countries in major highway programs. The term carless refers to more than just households that own no cars. It extends, in households with cars to those without licenses (old and young), the handicapped, and even the licensed drivers who have no access to the family car when it is in use elsewhere (e.g. at work). The most severely effected are those in urban areas and especially the urban poor. Transportation expenses are limited for the poor when other family expenditures (food, shelter) take a high priority. Once the work trip has been satisfied, money for other trips, for the poor, is not always available. One solution to cost-free travel is pedestrianism (walking), but this too is difficult in urban areas where the pedestrian has been overlooked in favor of the car. Solutions to problems of the carless include dial-a-ride, better public transit, and better design of urban form.
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    Transportation 2 (1973), S. 411-430 
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    Notes: Abstract This paper reviews the results of an origin-destination survey conducted in Beirut, Lebanon. The survey was conducted according to the techniques developed and used in the U.S.A. There has always been some doubt that methodologies and techniques, namely dwelling unit interviews, developed for use in U.S. cities would work in cities of developing countries. The results of the study indicated that such methods proved to be useful and effective. In spite of the higher residential density and lower level of car ownership, trip rates in the city of Beirut were within the ranges observed in U.S. cities. The comparison of travel parameters acquired from various cities around the world might show that the regularities and trends in urban transportation are universal.
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    Transportation 2 (1973), S. 431-442 
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    Transportation 2 (1973), S. 453-454 
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    Transportation 2 (1973), S. 443-451 
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    Transportation 2 (1973), S. 53-70 
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    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The trip end models which have been used in past transportation studies are briefly summarised. Problems associated with the use of zone-based models are outlined and reasons are given to support the development of models at the household rather than zonal level. It is suggested that recent developments which have taken place in household-based models have not been entirely logical. In particular, arguments between regression models and category analysis models have been confused with the use of aggregate (zonal) as against disaggregate (household) data — regression models being associated with the use of zonal data and category analysis models with household data. Misunderstood arguments and false notions regarding sample sizes have directed attention from the regression analysis approach. A detailed comparison of the category analysis and regression analysis methods for developing household-based trip end models is given. Both methods have been applied using data from the Monmouthshire Land Use Transportation Study. The regression results reported are from a very preliminary analysis and contain a number of anomalies, although it is thought that sufficient work has been done to provide an objective evaluation of the two methods. It is recommended that the household regression approach should be further investigated since it has advantages as a modelbuilding procedure and makes better use of sample data. A certain amount of categorisation of household types is necessary and the investigations would attempt to determine the best balance between categorisation and regression fitting. Further development will be restricted if the trend towards minimum sample sizes of about 1000 households is continued. Larger samples should be taken in certain circumstances to pursue development work.
    Type of Medium: Electronic Resource
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  • 99
    Electronic Resource
    Electronic Resource
    Springer
    Transportation 2 (1973), S. 87-96 
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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  • 100
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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