Travel time reliability has become an important factor in route choice analysis and is one of the key indicators for traffic performance measurement. Hence this study assessed the ten corridors of the Adelaide Metropolitan road network’s... more
Travel time reliability has become an important factor in route choice analysis and is one of the key indicators for traffic performance measurement. Hence this study assessed the ten corridors of the Adelaide Metropolitan road network’s travel time reliability by using the Buffer Time and Planning indices. The findings show that the Buffer Time indices for the selected corridors may significantly vary and for some corridors, they reach almost 100 per cent. Since the buffer time index seems to overestimate the travel time reliability measurement, a detailed assessment of the travel time distribution was also conducted. This analysis shows that none of the travel time distributions follow the normal distribution. However for some corridors the log normal distribution would fit the travel time distribution.
Research Interests:
Prospects for the decarbonising of Australian cities will depend on opportunities for a reduction of transport energy use. This project focuses on the most significant challenge to Green House Gas reduction in urban transport --... more
Prospects for the decarbonising of Australian cities will depend on opportunities for a reduction of transport energy use. This project focuses on the most significant challenge to Green House Gas reduction in urban transport -- specifically, that relating to provision of public transport and active travel options for low density suburban areas that are currently car dependent. As part of the interim deliverables for this project, the research team has undertaken an environmental scan of international best practices and trends in the provision of high-priority, transformative initiatives to tackle the mobility challenges facing both urban and suburban communities. The report gathers and collates information from a wide body of literature to assist the CRC partner organisations in responding to the impacts of this global challenge, and to inform their policy and advocacy positions.This report starts by providing the background to this project, its aims and objectives which are focuse...
Research Interests:
From the end of World War Two, the use of public transport in Australian cities declined as the automobile industry grew and car ownership increased rapidly. Over time the car has evolved beyond being a means of transportation into being... more
From the end of World War Two, the use of public transport in Australian cities declined as the automobile industry grew and car ownership increased rapidly. Over time the car has evolved beyond being a means of transportation into being a subject of interest and a cherished part of their lifestyle for many people. In Australia, the car population is growing faster than the human population, and more than 90 per cent of Australians live in a household with access to a car. Traffic congestion has become a major problem, particularly in urban areas. Due to this congestion, private vehicle users are spending more time on roads. Bus patronage is generally weak around the country, to some extent because of the growing levels of congestion. Efforts must be made to shift at least a small percentages of car trip users to public transport to address this problem. This report's objective is to analyse and understand the current travel demand.
Research Interests:
In Australia, level crossing safety has been a major concern to road and rail authorities. This paper considers the issues related to heavy vehicles safety at level crossings. The aim of the paper is to introduce Petri nets--a graphical... more
In Australia, level crossing safety has been a major concern to road and rail authorities. This paper considers the issues related to heavy vehicles safety at level crossings. The aim of the paper is to introduce Petri nets--a graphical and mathematical modelling tool in assessing the scale of risk at level crossings when heavy vehicles passing through intersecting areas. The Petri nets tool, ∏-tool is used to establish the model which is tested using different heavy vehicle percentages on selected level crossing locations in South Australia. The results demonstrated factors such as traffic level of service (LOS), heavy vehicle percentages and the distance of the level crossings to or from the nearest intersection are associated with an increased risk when a heavy vehicle being involved in level crossing collisions. The Petri nets and ∏-tool appear to be suitable for assessing the safety and performance of level crossings.
Research Interests: Engineering and Petri Net
Concepts and methods for analysing accessibility are essential for understanding many significant social, economic, and political issues. All accessibility measures seek to define the level of opportunity and choice taking account of both... more
Concepts and methods for analysing accessibility are essential for understanding many significant social, economic, and political issues. All accessibility measures seek to define the level of opportunity and choice taking account of both the existence of opportunities, and the transport options available to reach them. To study these issues this research has focused on the Australian road network as the primary database with the interest in accessibility directed at those who live in rural and remote areas, rather than urban dwellers. At first stage, this research focuses on spatial approaches to the conceptualisation, measurement, and analysis of accessibility at the regional level. At next level, this research attempts to analyse socio-economic indicator (Income) in regional Australia and relate it to road network accessibility. In the final stage attempt has been made to identify the weak spots in the regional road network based on the extent of accessibility changes.
Research Interests:
A lack of integration in transport and land use modelling systems has been a major handicap for strategic planning operations in many cities; hence there is a need for a more interactive, flexible and accurate system that can meet various... more
A lack of integration in transport and land use modelling systems has been a major handicap for strategic planning operations in many cities; hence there is a need for a more interactive, flexible and accurate system that can meet various sustainable planning objectives. This chapter discusses the theoretical development of the relationship between transport and land use models. Previous practices show that a combination of bid-rent theory and random utility theory would provide mutual benefits for transport and land use models. Bid-rent models provide the location of activities with households and firms, which helps the estimation of random utility mode choice models in transport models. In turn, the output of transport models can be used to measure accessibility in land use models. This chapter also highlights the importance of using data base manager to include Revealed Preference data, Stated Preference data and Bluetooth data. Two current practices in Adelaide and Perth are ana...
Research Interests:
Research Interests:
The study focuses on a technique for sustainability assessment through cumulative effects assessment (CEA) of road transport sector, the performance of which relies on the performances of the factors (stressors) affecting the system.... more
The study focuses on a technique for sustainability assessment through cumulative effects assessment (CEA) of road transport sector, the performance of which relies on the performances of the factors (stressors) affecting the system. Planning for a system‟s sustainability thus depends on the interconnectedness of system stressors and their degree of connectivity. Therefore CEA can be a potential analytical approach for sustainability assessment because it provides an integrated framework with environmental, social or economic considerations drawn from multiple stressors‟ connectivity of any complex system. The study aims in conceptualizing the process to assess the degree of connectedness among the stressors affecting transport system through digraph and matrix analysis and conducting economic evaluation of the impacts on the system stakeholders. The innovative idea of the research is to account the synergistic effect of road transport sector (rather than accounting effects separate...
Research Interests:
Research Interests:
Research Interests:
Accessible transportation is a key aspect of independent living. As the impact of population ageing on future transport systems is expected to be increasingly felt over the next few decades in a number of countries, including Australia... more
Accessible transportation is a key aspect of independent living. As the impact of population ageing on future transport systems is expected to be increasingly felt over the next few decades in a number of countries, including Australia and Japan, it is logical to recognise the importance of formulating appropriate transport policies in ageing societies. However, few studies in Australia have focussed on this issue as most of them have been devoted to the physical dimensions of health. This paper is based on a recent survey of older South Australians and a series of in-depth discussions conducted with key stakeholders both in Australia and Japan, conducted by the principal author. This paper highlights the accessible transportation and mobility issues in Australia’s ageing society by shedding light on some of the important policies and laws prevailing in Japan, which have already reached the proportion of the older population that Australia is projected to be 10 years from now. Our f...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Adaptive computer controlled traffic management systems are used to monitor and control traffic signals all around the world. The Sydney Coordinated Adaptive Traffic System (SCATS) was developed in 1970s and has demonstrated great... more
Adaptive computer controlled traffic management systems are used to monitor and control traffic signals all around the world. The Sydney Coordinated Adaptive Traffic System (SCATS) was developed in 1970s and has demonstrated great benefits for isolated and area linked signalised intersection controls [1, 2]. These systems also collect and store extremely large amounts of data that can be useful input to the transportation planning and management process [3-7]. The development of a traffic data abstraction layer would ...
It is common knowledge that route location analysis requires an accurate estimation of the population using the transit system. The gross patronage potential of a route is based on the population residing within the service catchment... more
It is common knowledge that route location analysis requires an accurate estimation of the population using the transit system. The gross patronage potential of a route is based on the population residing within the service catchment area. Population is the best representation of potential usage, in terms of daily trips, at the point of origin. Once the service area for a transit is identified, population information for this area is used as an input to travel demand models for ridership estimation. Hence the transit operating agencies are often interested in potential population coverage of any transit route they intend to operate. Similarly they will also be interested in transit coverage Level of Service (LOS) issues. In order to estimate the population coverage of a route and to estimate the transit coverage LOS for the region, in a quick and efficient way, tools are developed using GIS. This paper explains the concept and procedure of the development of GIS tools created in this study. The tools developed are in the form of extensions for the GIS software ArcView 3a. As a part of this research, two extensions are developed; the first extension (TraSA_PopC’ge. avx) allows the user to interactively estimate the population coverage of the bus route by four different methods. The second extension (TraSA_LOS-C’ge. avx) is used to estimate the Level of Service of the bus routes for a region by four different methods. This paper explains the sequence of steps involved in the development of these two extensions.
Research Interests:
Obesity, greenhouse gas emissions, and oil dependence are major concerns of sustainability in Australian socie ty 1. One factor is the increasing share of private vehicle using contributes to these problems. Another factor is suburban... more
Obesity, greenhouse gas emissions, and oil dependence are major concerns of sustainability in Australian socie ty 1. One factor is the increasing share of private vehicle using contributes to these problems. Another factor is suburban development, widely criticized for its contribution to longer average trip lengths and excessive dependence on private vehicles at the expense of public transport and non-motorized modes.
Many community planners and policy makers around the world, motivated by a desire to reduce auto use and its related environmental consequences, are embarking on planning measures that would increase the use of non-motorised... more
Many community planners and policy makers around the world, motivated by a desire to reduce auto use and its related environmental consequences, are embarking on planning measures that would increase the use of non-motorised transportation, mainly, walking and cycling (Krizek, 2004). The Australian government advocates efforts that would promote and establish Australia as a cycle-friendly nation (Austroads, 2005). Many local governments' priorities include encouraging people to cycle by providing cycling infrastructure. Cycling ...
Research Interests:
Abstract: Level crossing safety is a complicated subject, which is determined by numerous aspects including engineering factors, human errors and combination environments surrounding level crossings. This paper introduces a holistic... more
Abstract: Level crossing safety is a complicated subject, which is determined by numerous aspects including engineering factors, human errors and combination environments surrounding level crossings. This paper introduces a holistic approach in level crossing safety modelling by using Petri nets. The main aim of this paper is to study the effect of the traffic and train characteristics on safety measurement at level crossings. The result indicates that level of service (LOS) and the level crossing distance from the nearest intersection are ...
Research Interests:
South Australia's population structure is set to change substantially over the next 50 years as the 'baby boomers' move en-masse into the 65+ age group. In June 2008, 15 per cent of the population in South Australia was... more
South Australia's population structure is set to change substantially over the next 50 years as the 'baby boomers' move en-masse into the 65+ age group. In June 2008, 15 per cent of the population in South Australia was aged 65 years or over, by 2056 this value is expected to increase to 25 per cent. Despite the pace at which South Australia is ageing, there is no high level strategy for providing for the transport needs of older people. The objective of the study is to conduct an audit of older people's current transport needs and ...
Research Interests:
Hot Spot (or “black spot”) identification is an important part of traffic engineering as it offers high safety benefits on investment and responds to community and media interest in places with high crash frequencies. One of the... more
Hot Spot (or “black spot”) identification is an important part of traffic engineering as it offers high safety benefits on investment and responds to community and media interest in places with high crash frequencies. One of the difficulties is the low frequency of crashes and the subsequent long periods of data collection needed to make statistically valid decisions.
Research Interests:
In relation to the development of travel time reliability metrics, previous studies had suggested that the travel time variability distribution might follow either normal or lognormal forms. From substantial new data observation... more
In relation to the development of travel time reliability metrics, previous studies had suggested that the travel time variability distribution might follow either normal or lognormal forms. From substantial new data observation undertaken in Adelaide, including assessment of two sets of longitudinal trip time data, these distributions appear inadequate. Generally this is because the upper tails of the observed distributions are more substantial than those of the normal or lognormal distributions. Additionally, there is some evidence of bimodality ...
Research Interests:
Ageing of the population is one of the major changes being experienced by Australia. New strategies for engaging with older people and providing better services are needed. Much of the discussion around population ageing considers issues... more
Ageing of the population is one of the major changes being experienced by Australia. New strategies for engaging with older people and providing better services are needed. Much of the discussion around population ageing considers issues associated with an increasing proportion of older people; for example, the provision of health and disability services, and family and community care. However, as population ageing also relates to declining mobility, it has implications for all sectors including transport. Quality of life in old age is ...
Research Interests:
Whenever a subdivision is developed in a suburban region of a medium sized city, bus operators often receive requests to link the city centre with the new locality via new routes. The main objective of this study was to present the... more
Whenever a subdivision is developed in a suburban region of a medium sized city, bus operators often receive requests to link the city centre with the new locality via new routes. The main objective of this study was to present the development of a methodology that enables bus operators to quickly analyse the transit service areas, efficiently plan new transit paths or extend an existing bus route by maximizing the bus route coverage and minimising the route deviation. This research has proved that it is worth considering options to maximise the multi-criteria in planning a transit alignment for connecting origin-destination zones with a new bus service. This research also proves that it is not always prudent to plan bus routes based on a single traditional criterion (i.e. population coverage) and highlights the importance of multi criteria approach. This research also developed Geographic Information Systems (GIS) tools that will help the route planning agencies in medium sized cities in their efforts to maximize the bus route coverage when planning a new bus service or extending an existing service.
Research Interests:
Abstract: The central point of this paper is whether there is a significant association between the macroscale attributes of the urban area where a householder has chosen to live and the number of vehicles owned by the household. A little... more
Abstract: The central point of this paper is whether there is a significant association between the macroscale attributes of the urban area where a householder has chosen to live and the number of vehicles owned by the household. A little systematic effort, in fact, has been made to treat vehicle ownership within a broader framework of household choice regarding housing location, workplace, and travel patterns. Therefore, it is still unclear how land uses patterns impact upon the level of vehicle ownership although a few studies tried to explain ...
Research Interests:
Research Interests:
Recent consumer surveys and empirical studies suggest linkages between property accessibility, neighborhood built environment, and residential property values. This paper describes a comprehensive study that was undertaken to understand... more
Recent consumer surveys and empirical studies suggest linkages between property accessibility, neighborhood built environment, and residential property values. This paper describes a comprehensive study that was undertaken to understand the impacts of property accessibility, neighborhood built environment, and other contributing factors on single-unit and multiunit residential property values. The study used a sample of more than 4,500 single-unit and 2,300 multiunit residential properties collected in more than 1,800 neighborhoods of Adelaide, Australia. Hedonic house price models were applied to study the similarities and dissimilarities of the impacts of types of property accessibility (property accessibility to retail locations and to social and recreational locations by walking, public transit, and automobile), neighborhood built environment (land use mix, residential density, and intersection density), and other contributing factors (physical attributes of the property, social...
Research Interests:
This paper explores mobility of older people in Metropolitan Adelaide using existing datasets together with data from a recent (2010) travel survey of older people (N= 117). Findings derived from qualitative and quantitative methods... more
This paper explores mobility of older people in Metropolitan Adelaide using existing datasets together with data from a recent (2010) travel survey of older people (N= 117). Findings derived from qualitative and quantitative methods suggest that older people's mobility, when measured by daily trip, distance travelled, and trip chain complexity, decreases with increasing age. Socio-economic characteristics, eg age, gender, income, driving licence, living alone, length of current residence, and mobile phone ownership as ...