Search results for "Transport planning"
showing 10 items of 17 documents
Informational interactions and the future of cities
1998
Present-day city growth is chiefly the result of new tertiary activities such as financial and producer services, R&D, or business administration. It seems that these activities need to be more spatially concentrated than traditional manufacturing activities. These new trends affect both the structure of cities and the structure of city systems. The specific nature of the new activities concentrated in city centers makes them information intensive. These activities consume human capital, knowledge and hightech capital, which are all rapidly changing inputs; they are based on complex decisionmakingprocesses; this renders them highly information-dependent. Inasmuch as these activities are the…
Appropriateness between physical space and multicentre economic space in localization problems
1991
Location models are constructed in mathematical economic spaces whereas people locate themselves in real or physical spaces. If economic spaces are multicentric ones, their properties are different from physical spaces. We say that these two spaces are not symmetric. Hence, mathematical location model can lead to an optimal location solution which doesn't' exist in physical space. But, if we admit that an optimal location solution owns more or less to a function of demand of location, we can resolve this question. Then, fuzzy demand functions of location are defined in multicentric spaces and an illustration of this concept is presented.
Editorial: Special issue on Simulation in Transportation
2020
Transportation systems and related policies are complex and cross-sectoral, covering different socio-economic and management aspects, and involving multiple stakeholders (such as users, operators, and public policymakers). Mobility and accessibility are central to economic and societal well-being, yet the process of doing so may have significant impacts on land use, environment, and public health. Furthermore, the many feedbacks involved occur at varying degrees of spatial, temporal, and socio-demographic granularity and levels of uncertainty. Simulation models are well established in transportation-related operational research and management science, and the alternative approaches of Syste…
'Where Have I Heard It?' Assessing the Recall of Traffic Safety Campaigns in the Dominican Republic
2021
Although traffic crashes are the eighth leading cause of death in the world, and are linked to vehicle and infrastructure-related factors, crash-related fatality rates are much higher in lowincome countries. Particularly, the Dominican Republic is the country with the highest accident rate in the whole American continent. Therefore, in the past few years, public agencies have been developing different measures aimed at reducing traffic fatalities, including road safety campaigns. The aim of the present study was to assess the recalling of such campaigns among the Dominican population, which may serve as an additional indicator to evaluate their effectiveness in this and other countries of t…
Economic geography and growth: recent advances and new results
1997
Two fields of economic theory have developed recently in parallel: on the one hand, economic geography aims to explain the formation of a heterogeneous space, i.e.how the agglomeration of households and firms determines differentiated regions, urban structures or urban systems; on the other hand, theories of endogenous growth propose new views on growth mechanisms which invalidate the traditional convergence rule. Thesetheories are based on common foundations such as increasing returns, spatial externalities and monopolistic competition. We examine here in some detail how the spatial dimension is implicit in endogenous growth theories. We emphasize the whys and wherefores of the combination…
De von Thünen à Fujita : continuité ou rupture ?
1996
L'histoire de la pensée économique spatiale fait apparaître quatre grands paradigmes qui se rattachent respectivement aux travaux initiateurs de von Thünen, Weber, Christaller et Lösch et enfin Hotelling (Ponsard, 1983). En y ajoutant les apports d'autres auteurs, comme Lauhnardt et Greenhut (Norman, 1993), et en étudiant les complémentarités et les interactions entre ces paradigmes (Ponsard, 1983 ; Fujita, Ogawa et Thisse, 1988 ; Fujita et Thisse, 1986), on a pu souvent souligner les pertinences actuelles, théoriques et empiriques, de ces contributions historiques. Mais cespertinences dépassent également le champ strict de l'économie spatiale, puisque certaines théories de l'économie inter…
Town, industry and city
1995
Une première partie regroupera quelques réflexions conceptuelles et méthodologiques sur les économies d'agglomération et le phénomène d'agglomération. On y trouvera des précisions sur les sources, la nature et le classement des économies d'agglomération et des forces qui peuvent les contrarier, ainsi que sur la dynamique propre du phénomène d'agglomération. Dans une deuxième partie, nous examinerons plus précisément l'intérêt et les limites de l'assimilation entre l'agglomération de la production et la ville, en analysant comment la dimension productive est liée aux autres dimensions de la ville, notamment la dimension sociale. Nous chercherons en particulier quelles représentations de la v…
Heart healthy cities : Genetics loads the gun but the environment pulls the trigger
2021
Abstract The world’s population is estimated to reach 10 billion by 2050 and 75% of this population will live in cities. Two-third of the European population already live in urban areas and this proportion continues to grow. Between 60% and 80% of the global energy use is consumed by urban areas, with 70% of the greenhouse gas emissions produced within urban areas. The World Health Organization states that city planning is now recognized as a critical part of a comprehensive solution to tackle adverse health outcomes. In the present review, we address non-communicable diseases with a focus on cardiovascular disease and the urbanization process in relation to environmental risk exposures inc…
La ville abstraite : une analyse des représentations théoriques de la ville
1995
Par le terme générique de ville abstraite, nous désignons les représentations de la ville sur lesquelles s'appuie un discours théorique, économique, géographique ou social, positif ou normatif, ou qui sont l'objet d'un tel discours. Ces représentations sont des constructions mentales conscientes réalisées dans le but explicite de donner du sens à la ville, c'est-à-dire de n'en retenir que certains éléments jugés significatifs pour ce que l'on veut démontrer. Nous distinguons ce type de représentation de deux autres que nous ne traitons pas. La première est celle de la ville perçue. C'est une représentation mentale qui se construit dans l'esprit de l'individu qui se localise, vit dans la vil…
Economic theory and space : a reconciliation
1997
Malgré des apports importants au XIXe siècle et dans la première moitié du XXe et en dépit des efforts de l'après guerre, l’économie spatiale est longtemps restée un domaine marginal par rapport au corpus principal de la théorie économique. L’attachement aux hypothèses de concurrence pure et de rendements non croissants explique en grande partie cette séparation. Depuis quelques années, on assiste, dans le cadre de l'Economie géographique, à un mouvement d’intégration dont le moteur principal est la reconnaissance et l’exploitation des rendements croissants comme explication de la formation de l’espace économique. Ce papier présente un panorama de 25 années d’économie spatiale en soulignant…