published_or_final_version / abstract / Transport Policy and Planning / Master / Master of Arts in Transport Policy and Planning

published_or_final_version / Urban Planning and Environmental Management / Master / Master of Science in Urban Planning

With the increased concern as to sustainable development in recent years, there is a need to develop a sustainable transport system as urban transportation plays an important role in cities. Transportation is an important part of daily life as it is related to mobility; and enhanced mobility will contribute to economic development and improve the quality of life. However, the most commonly used transport modes (i.e. motorised transportation) have contributed to heavy air and noise pollution, degrading our environment and affecting people’s quality of life. With this unsustainable urban transport system, there is an urgent need to apply the principles of sustainable development to the development of the transport system. The aim of this study is to revisit the general transport hierarchy, examine how the hierarchy varies according to geographical and trip characteristics, and propose new sustainable transport hierarchies that take local contexts, availability of existing infrastructures, travel distance, and income level into consideration. In this study, Hong Kong is chosen as the focus of the study despite the fact that government has already identified the heavy rail system as the backbone of Hong Kong’s transport system, and 90% of all travel trips in Hong Kong are carried out on public transport, yet there is much room for improvements, for example the high roadside air pollution, the public transport are not fully utilised, non-motorised transport modes are not widely used, and the public transport fares are on the high side. The Travel Characteristics Survey 2001 will be used for examining trip characteristic variations in Hong Kong. The findings suggest that the general transport hierarchies in Hong Kong do not match with the theoretically most sustainable transport hierarchy. Furthermore, the findings suggest that travel distance and income level have an effect on people’s choice of transport modes. The results give a better understanding of the overall sustainability of Hong Kong’s transport system and its local variations so that supportive policy can be formulated to further promote sustainable transportation based on the local characteristics, such as the availability of infrastructure, and the socio-economic and travel characteristics of residents in different districts. / published_or_final_version / Geography / Master / Master of Philosophy

University of Macau / Faculty of Science and Technology. / Department of Civil and Environmental Engineering

This dissertation is concerned with developing new methods for exploring the pressing problems of uncertainty, Environmental Justice, and tolling as they relate to long-range transportation planning. While these topics are seemingly disparate, much of the work in this dissertation is motivated by the increasing number of roadway projects concessioned to the private sector, and the lack of tools available for evaluating the impact of such agreements on the public given high levels of uncertainty over the length of the contracts and concern for the welfare of traditionally underserved population groups. These issues will be considered separately and together, offering insights into how transportation investment decisions can be improved. To this end, the impacts of considering long-range uncertainty in the traffic assignment model as well as in an integrated transportation and land use model (ITLUM) are assessed in terms of the effects on network performance measures and roadway improvement decisions. A new method for accounting for correlations between the future travel demands of origin-destination zone pairs is developed for the traffic assignment problem that can more effectively model the effects of potential economic changes. Results showed that neglecting correlations can lead to measures of variance of future total system travel time that range from underestimating the actual measure by seventy-five percent to overestimating it by one hundred percent, and to different selections for a network improvement project in up to fifty percent of all scenarios. Uncertainty in a basic ITLUM is considered more broadly, incorporating probability distributions for population and employment inputs as well as several travel demand model parameters, and examining how the choice of performance measure impacts the effect of uncertainty on the decision of where to increase system capacity. Comparing the network improvement projects selected when uncertainty is considered to a deterministic analysis, showed differences in up to 25% of scenarios. Challenges of considering Environmental Justice, a type of group-based equity that is required for metropolitan transportation plan compliance in the United States, are explored, particularly with regard to appropriately defining the term equity for the analysis. Several of these potential definitions are then transformed into objective functions for use in a new formulation of the user equilibrium-based discrete network design problem. A multi-objective genetic-algorithm solution method is developed to solve the problem efficiently, and insights are revealed into how different definitions of equity can lead to different decisions. The following objectives, both commonly used in practice, were found to be conflicting: 1) minimizing the difference in post-improvement performance across populations and 2) minimizing the difference across populations in the change in performance due to improvements. The problem of roadway tolling is first examined from the perspective of a private sector toll road operator seeking to maximize the asset's value by exercising flexibility. A stochastic recourse model is developed to account for the first stage investment decision and the second stage decisions to alter network capacity and toll rates. The flexibility to engage in non-compete clauses whereby the public sector cannot improve competing roadways, and also to improve feeder links in the surrounding network were found to play important roles in asset valuation. The value of having these options was found to increase with an increase in uncertainty of future demand, complexity of network structure, and the consequence of failure to meet debt obligations. The three original issues of uncertainty, Environmental Justice, and tolling are woven together into the development of a new method for determining the maximum toll rate that can be applied in a private sector operation scenario (first option) such that each group within the population, as defined for analysis of Environmental Justice, is no worse off than if the road had been constructed by the public sector without tolling (second option). Three stochastic dominance criteria are implemented to find the toll rate at which the first option dominates the second given uncertainty about the future travel demand. Findings suggest that there may be many toll rates that equate the benefits resulting from the two options, so the minimum rate is considered the optimal one. The difference in benefits to the groups was found to increase with increasing value of time, and the differences in optimal toll rates using each of the three dominance criteria increased similarly. The analytical tools developed in this dissertation, and the resulting insights obtained should offer significant contributions to several areas of long-range transportation planning, particularly informing the process of concessioning roadways to private entities, developing a transportation system that is robust to future uncertainty, and ensuring that Environmental Justice criteria is met by considering the transportation needs of each group within the population. / text

A research report proposal submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, in partial fulfillment of the requirements for the degree of Masters of Architecture (Professional). January, 2019 / In recent years, research studies have shown an increase in stress levels especially among people living in cities. Clear links have been established correlating wellbeing with the environment. Studies show that urban environments increase tendencies of unhappiness and stress among people. This study identifies inefficiency in systems that facilitate mobility as one of the causes of stress among city users. It recognises mobility as a core component of any system that facilitates the efficient flow of things between points. Inadequacy in systems of mobility can therefore cripple a system by preventing the free movement of things from one point to another. Like so many developing cities, the urban environment of Kampala, the capital of Uganda that is undergoing rapid urbanisation and often unchecked development faces challenges regarding mobility. In Kampala, majority of the population either walk or rely on public transportation and yet the inadequate infrastructure and systems of mobility denies them the right to freely and easily access and navigate their city. This both directly and indirectly results in physical and psychological stress in city users leading to frustrations and financial losses and consequently prevents wellbeing. The study focuses on the Old Taxi Park which is the most frequently used public transportation facility for daily short trips around the city of Kampala. Recognising that the failing state of infrastructure and inadequate systems of organising the movement of vehicles and people in and around the park render it one of the black spots that contribute to and often escalate the problems regarding mobility presents the Old Taxi Park as a suitable site for a project to address the city’s navigational challenges. This is aimed at mitigating stress among the people who engage with the city. The project thus proposes a revamp of the Old Taxi Park to facilitate efficient movement of people within Kampala. In order to further enhance wellness, the project draws on the healing and restorative power of nature. Although nature has been linked to improved well being, having been found to have numerous restorative benefits especially for people who constantly interact within densely inhabited fast paced settings, the city centre of Kampala which has the highest population density and fastest pace of life in the entire city critically lacks instances where people can interact with and so benefit from the nurture of the elements of nature. Therefore this research project takes an approach of reintroducing various elements of nature to the urban fabric through the design of the transportation hub and how it integrates with Kampala’s urban fabric. The main objectives for the project are hence to promote efficiency in the systems of mobility and to reintroduce nature within the urban sphere in order to promote wellness for the people who interact with the concrete jungle that was once the City of Seven Hills / MT 2019

published_or_final_version / Urban Planning / Master / Master of Science in Urban Planning

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

No description available.

published_or_final_version / Civil and Structural Engineering / Doctoral / Doctor of Philosophy