Thesis (Ph. D. in Civil and Environmental Engineering)--University of California, Berkeley, Fall 2004. / "September 2005." Includes bibliographical references (p. 46-47). Also available online via the ITS Berkeley web site (www.its.berkeley.edu).

We propose a distributed, collaborative traffic congestion detection and dissemination system using VANET that makes efficient use of the communication channel, maintains location privacy, and provides drivers with real-time information on traffic congestions over long distances. The system uses vehicles themselves, equipped with simple inexpensive devices, as gatherers and distributors of information without the need for costly road infrastructure such as sensors, cameras or external communication equipment. Additionally, we present a flexible simulation and visualization framework we designed and developed to validate our system by showing its effectiveness in multiple scenarios and to aid in the research and development of this and future VANET applications. / by Francisco M. Padron. / Thesis (M.S.C.S.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

Cheung, Kin Tai. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 34-35). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgements --- p.iii / Contents --- p.iv / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Literature Review --- p.4 / Chapter 3 --- Data Description --- p.7 / Chapter 4 --- Ordinary Least-Squares and Fixed-Effect Estimations --- p.10 / Chapter 4.1 --- OLS Estimation --- p.10 / Chapter 4.2 --- Fixed-Effect Estimation --- p.13 / Chapter 5 --- Cross-sectional and Fixed-Effect IV Estimations --- p.16 / Chapter 5.1 --- Cross-sectional IV Model --- p.16 / Chapter 5.2 --- Fixed-Effect IV Model --- p.23 / Chapter 6 --- Conclusion --- p.29 / Appendix --- p.30 / Estimation Results for Honshu Island --- p.30 / Ordinary-Least Squares Results in 150 observations regression --- p.33 / References --- p.34

O presente trabalho analisa e discute a crise de mobilidade cotidiana nas duas últimas décadas, em São Paulo, tendo em vista o agravamento gradativo das condições de circulação viária na metrópole paulistana. Considerando o espaço como produto, condição e meio de reprodução das relações sociais, defendemos a tese de que a atual crise da mobilidade cotidiana advém de um conjunto de medidas que foram formuladas e implantadas através de políticas econômicas de orientação neoliberal, com destaque para os novos meios de financiamento à produção do espaço urbano e à reorganização produtiva da indústria automobilística nacional, bem como para as estratégias voltadas ao incentivo do consumo de bens duráveis, viabilizado pela ampliação das linhas de crédito para a aquisição de bens duráveis, principalmente carros. A esses elementos associam-se outros, tais como: a extensão e a densidade da ocupação urbana, a baixa qualidade dos sistemas de transportes coletivos e o traçado da infraestrutura viária. A apreciação conjunta desses elementos constitui o quadro a partir do qual realizamos nossa análise / This dissertation analyzes and discusses the crisis of daily mobility in the past two decades in São Paulo, caused by the gradual worsening of the conditions of road circulation in the metropolis. Regarding space as a product, a condition and a means of the reproduction of social relations, we put forth the hypothesis that the current crisis of mobility is the outcome of a number of actions that were formulated and implemented as part of neoliberal economic policymaking. Among such actions are the new sources of credit for the production of urban space, the restructuring of the domestic automobile industry and the strategies that encourage the purchase of durable goods (especially cars) made possible by the expansion of consumer credit. Other elements combine with these three basic causes, such as the low quality of public transit systems and the road layout. By taking account of all these elements together, we build the framework upon which we carry out our analysis

Transportation problems such as traffic congestion and traffic emission draw growing attention along with rapid urbanization and growth of urban transportation sector in developing countries. This dissertation focuses on a series of transportation policies implemented by the government of Beijing and explores their potential effects in the aspect of reducing traffic congestion, improving air quality, and saving energy. This dissertation is composed by three essays. The first essay exploits an idiosyncratic feature of a driving restriction policy and examines the effects of having more vehicles on the road on traffic congestion, ambient air pollution, and contemporaneous health. The findings suggest that traffic congestion has substantial environmental and health externalities in Beijing but that they are also responsive to policy. The second essay explores the effects of opening new subway lines on traffic congestion and ambient air pollution in Beijing. Results show that the expansion of subway networks significantly decreases traffic congestion, and is associated with improvements in air quality in areas located close to the newly opened subway lines. The third essay estimates the price and income elasticities of vehicular gasoline demand to explore the potential effect of fuel tax on transportation gasoline consumption in Beijing.

O presente trabalho analisa e discute a crise de mobilidade cotidiana nas duas últimas décadas, em São Paulo, tendo em vista o agravamento gradativo das condições de circulação viária na metrópole paulistana. Considerando o espaço como produto, condição e meio de reprodução das relações sociais, defendemos a tese de que a atual crise da mobilidade cotidiana advém de um conjunto de medidas que foram formuladas e implantadas através de políticas econômicas de orientação neoliberal, com destaque para os novos meios de financiamento à produção do espaço urbano e à reorganização produtiva da indústria automobilística nacional, bem como para as estratégias voltadas ao incentivo do consumo de bens duráveis, viabilizado pela ampliação das linhas de crédito para a aquisição de bens duráveis, principalmente carros. A esses elementos associam-se outros, tais como: a extensão e a densidade da ocupação urbana, a baixa qualidade dos sistemas de transportes coletivos e o traçado da infraestrutura viária. A apreciação conjunta desses elementos constitui o quadro a partir do qual realizamos nossa análise / This dissertation analyzes and discusses the crisis of daily mobility in the past two decades in São Paulo, caused by the gradual worsening of the conditions of road circulation in the metropolis. Regarding space as a product, a condition and a means of the reproduction of social relations, we put forth the hypothesis that the current crisis of mobility is the outcome of a number of actions that were formulated and implemented as part of neoliberal economic policymaking. Among such actions are the new sources of credit for the production of urban space, the restructuring of the domestic automobile industry and the strategies that encourage the purchase of durable goods (especially cars) made possible by the expansion of consumer credit. Other elements combine with these three basic causes, such as the low quality of public transit systems and the road layout. By taking account of all these elements together, we build the framework upon which we carry out our analysis

The level of air pollution in urban areas, which is largely affected by road traffic, is an issue of high political relevance. Congestion is most prevalent in urban areas and a common and increasingly present phenomenon worldwide. The first four chapters of this study have investigated how and to what extent models, which are used to predict emissions on road links in urban road networks, include the effects of congestion on emissions. In order to make this assessment, traffic engineering literature and empirical studies have been examined and used as a basis to review (current) emission models that exist or have been used around the world. Congestion causes changes in driving patterns of individual vehicles in a traffic stream, and these changes are subsequently reflected in changes in congestion indicators and changes in emission levels. This consideration and a literature review has led to a proposed 'congestion typology' of emission models, which reflects the different ways in which and the extent to which congestion has been incorporated in these models. The typology clarifies that six of in total ten families of emission models that were investigated in this thesis explicitly consider congestion in the modelling process (i.e. model variables are related to congestion), although this is done in different ways. For the remaining four families of emission models it was not possible to determine the extent to which congestion has been incorporated on the basis of literature review alone. Two families fell beyond the scope of this work since they cannot be used to predict emission on road links. For the other two families it became clear in the course of the thesis that the extent can be determined through analysis of driving pattern data (and other information with respect to e.g. data collection) that were used in the model development. A new methodology is presented in this thesis to perform this analysis and to assess the mean level of congestion in driving patterns (driving cycles). The analysis has been carried out for one important family of emission models, the so-called travel speed models ('average speed models'), which are used extensively in urban network modelling. For four current models (COPERT III, MOBILE 6, QGEPA 2002, EMFAC 2000), it is concluded that these models implicitly (i.e. congestion is inherently considered) take varying levels of congestion into account, but that this conclusion is subject to a number of limitations. It became clear in the course of this study that prediction of (the effects of) congestion in both traffic models and emission models is generally restricted to certain modelling dimensions. As a consequence, the effects of congestion are only partially predicted in current air emission modelling. Chapter 5 has attempted to address the question whether congestion is actually an important issue in urban network emission modelling or not. It also addressed the question if different types of emission models actually predict different results. On the basis of a number of selection criteria, two types of models were compared, i.e. one explicit model (TEE-KCF 2002) and two implicit models (COPERT III, QGEPA 2002). The research objectives have been addressed by applying these emission models to a case-study urban network in Australia (Brisbane) for which various model input attributes were collected from different sources (both modelled and field data). The findings are limited by the fact that they follow from one urban network with particular characteristics (fleet composition, signal settings, speed limits) and application of only a few particular emission models. The results therefore indicate that: 1. Changes in traffic activity (i.e. distribution of vehicle kilometres travelled on network links) over the day appear to have the largest effect on predicted traffic emissions. 2. Congestion is an important issue in the modelling of CO and HC emissions. This appears not to be the case for NOx emissions, where basic traffic composition is generally a more important factor. For the most congested parts in the urban network that have been investigated, congestion can more than double predicted emissions of CO and HC. 3. Different types of emission models can produce substantially different results when absolute (arithmetic) differences are considered, but can produce similar results when relative differences (ratio or percent difference) are considered.

Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 224-240). Available also in a digital version from Dissertation Abstracts.

Thesis (Ph. D. in Civil and Environmental Engineering)--University of California, Berkeley, 2003. / "Fall 2003." Includes bibliographical references (p. 131-136). Also available online at the ITS Berkeley web site (www.its.berkeley.edu/publications).

Though billions of dollars has been spent on traffic infrastructure in Hong Kong for the past decades, it is still an unsolved traffic problem. Especially in peak hours, vehicles have to pay for the traffic congestion in the way of waiting time and air pollution. The public is interested in congestion pricing as it is effective in allocating resource. Also the revenues raised in road pricing can be used to invest in transport infrastructures which will benefit the whole society, especially in Hong Kong where more than 90% trips are taken by public transit. The existing policy is that growth in the private vehicle fleet should not exceed 3% per year. Currently, the increase rate of private vehicles is much higher than 3%. This generates the need to do the feasibility of ERP system in tackling congestion in Hong Kong. The ERP system is not a new term for the public as the Hong Kong Government has done two studies about road pricing in 1983 and 1998. However, the studies did not promote the implementation of ERP system in Hong Kong for various reasons. At the same time, the ERP system has been tested successful in many areas, such as Singapore and London. Lessons learnt from the two cases will guide the implantation of ERP system in Hong Kong. The study is conducted to evaluate the proposed implementation of the ERP system and attempts to recommend on future practices in order to achieve a more efficient, equitable and flexible means of managing the road space particularly in congested areas during busy hours. Questionnaire surveys will be conducted to get data for analysis of effect of ERP system. Combined with analysis of supply of transport infrastructure in next five years, the research finding is that the ERP system is not proper to be adopt to solve traffic congestion in Hong Kong. / published_or_final_version / Urban Planning and Design / Master / Master of Science in Urban Planning