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A Transport Justice Evaluation of Employer-Based Transit SubsidiesHamre, Andrea Katherine Marie 24 January 2018 (has links)
National statistics regarding subsidized commuting suggest that employer-based transit subsidies may be inaccessible to the vast majority of the working poor. My main purpose with this study is to increase our understanding of employer-based transit subsidies from a transport justice perspective. I apply the theory of transport justice developed by Karel Martens to evaluate whether the provision of transit subsidies varies significantly by income, and whether the subsidies are significantly associated with accessibility as measured by daily trip levels. I use worker-level data from household travel surveys for 10 of the 22 largest MPOs in the U.S., organized into 7 cases: 1) Atlanta; 2) Baltimore and Washington, DC; 3) Denver; 4) Los Angeles and San Diego; 5) New York and Newark; 6) Philadelphia; and 7) San Francisco. In each of the 7 cases, the odds of being offered a transit subsidy were significantly lower for workers in the 1st income quintile compared to workers in the 4th and 5th income quintiles, even after controlling for other relevant worker and employer characteristics. I found a lack of evidence, in most cases, that transit subsidies are significantly associated with accessibility, both in terms of daily trip levels for low-income workers and daily trip differentials between income groups. Given my finding that low-income workers are the least likely to have access to employer-based transit subsidies, policymakers may consider reform alternatives, such as commuter benefit ordinances, a refundable tax credit for commuting expenses, or alternatives such as income- and location-based subsidies for transit that may support all trip purposes. I hope this study will serve as a reference for policymakers deliberating commuter benefit reforms as well as strategies to support affordable access to opportunities for the working poor. / Ph. D.
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Articulation temporelle des mobilités individuelles et impact CO2 dans les différents espaces résidentiels en France (des citadins vertueux, mais uniquement en semaine?) / Temporal structure of individual mobility and its CO2 impact in France according to type of residential area (are citizens virtuous only on weekdays?)Nguyen, Quang Nguyen 16 December 2014 (has links)
Les travaux de cette thèse visent la connaissance et la compréhension de l'articulation temporelle des mobilités individuelles (quotidiennes, de weekend et de longue distance) en France selon les localisations résidentielles, par taille d'aire urbaine et position par rapport au centre du bassin, via l'élaboration d'un diagnostic annuel en termes d'émission de CO2 afin d'éclairer la question du réchauffement climatique. A la description méthodologique de l'outil, s'appuyant sur les données de l'Enquête Nationale Transports et Déplacements 2007- 2008, succède la présentation de certains résultats marquants, déclinant la répartition de ces émissions selon les lieux d'habitat: Au delà des premières analyses descriptives, une caractérisation typologique des comportements de mobilité a abouti à quatre profils-types selon les budgets d'émissions de CO2 sur ces trois segments temporels de la mobilité. Chacun de ces comportements-types n'est pas uniquement repérable (ni uniforme) dans un seul type d'espace. Un certain « effet barbecue » est visible mais il n'est sans doute pas suffisamment fort pour pouvoir confirmer que les habitants des (grands) centres villes ruinent nécessairement durant le weekend leurs comportements plutôt vertueux en semaine grâce à l'utilisation de modes moins polluants. Les études de cas selon le genre, les grands voyageurs (grands pendulaires ou transcontinentaux), et certains motifs de déplacements (achat, loisirs), sont des coups de projecteurs qui ont apporté des résultats complémentaires. Enfin, l'analyse des taux d'occupation sur l'exemple de l'automobile pour des déplacements locaux a montré qu'un meilleur remplissage des véhicules est un facteur important de l'efficacité énergétique (et donc du CO2) des déplacements. / My thesis concern is about knowledge and in depth-understanding of the annual distribution of individual mobility in France (distinguishing daily, weekend and long distance trips) according to the residential locations (by category of urban areas) via the development of an annual CO2 emissions assessment, to address the issue of climate change. After a brief methodological description of the tool, using the dataset of the most recent French National Transport Survey (2007-2008), the paper presents some typical results, declining the distribution of CO2 emissions due to this mobility according to the zone of residence: beyond the initial descriptive analyses, a cluster analysis of mobility behavior results in four profiles of mobility according to the CO2-emissions budgets on these three time segments of mobility. It shows that each type of mobility behavior is not available (nor uniform) in only one type of space. A "cocooning effect" can be detected but it is probably not strong enough to confirm that the citizens of (large) city centers during the weekend necessarily ruin their rather virtuous behavior on week days through the use of less polluting modes. Case studies by gender, frequent travelers (pendulous or transcontinental), and some travel purposes (e.g. shopping, leisure) provide additional results. Finally, the analysis of occupancy rates of the car for local travel shows, that more passengers in a vehicle is an important factor for its energy efficiency (and therefore CO2) due to mobility.
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