Excess commuting: a critical review and comparative analysis of concepts,indices, and policy implications

The last three decades have witnessed substantial growth in the literature on excess commuting. Researchers have proposed and applied a number of commuting benchmarks and excess commuting indices that aim to evaluate the commuting efficiency and jobs-housing balance of cities. A comprehensive review and comparative evaluation of the proposed metrics in terms of their ability to capture the intended phenomena, while controlling for the other general characteristics of cities, has yet to be performed. This article attempts to fill this gap by examining four commuting benchmarks (minimum commute, maximum commute, random commute, and proportionally matched commute) and five excess commuting indices (excess commute, commuting potential utilized, commuting economy, normalized commuting economy, and effort). Our conceptual analysis of the indices is complemented with a comparative empirical analysis of commuting in thirty Canadian cities. We explore relationships between the indices and point out the strengths and limitations of each. The findings suggest that no single index can adequately capture the commuting performance of an urban area, while each index can be employed to address a specific policy question. Used together, the indices can provide a reasonably good understanding of urban form and commuting behavior.     

Powered-two-wheelers for city commuting: Insight from Australia's three largest capital cities

The journey to work receives a great deal of research attention due to the peak demand on the transport system. Cities are increasingly concerned with managing traffic congestion and reducing pollution and most of the focus of this research has been on cars, public transport, walking and cycling. In contrast, the role of powered two-wheelers (PTWs), including motorcycles and scooters, in commuting has received little attention, particularly in the context of cities in the developed world. This paper provides new insight into commuting by PTW by drawing on census journey to work data from Australia's three largest cities (Sydney, Melbourne and Brisbane) combined with an intercept survey of PTW commuters in Melbourne. It explores the extent of, and changes in, PTW commuting as well as the demographics of PTW commuters. While PTWs account for only a small percentage of urban commuting in Australian cities, their use is growing rapidly and there is a concentration of commuting by PTW into city centres. PTW commuters tend to be high-income males in skilled professional and technical professions. The implication of these findings for transport policy are discussed.     

The case of Paratransit - ‘Trotro’ service data as a credible location addressing of road networks in Ghana

Road networks are by far the largest mobility infrastructure in Sub-Sahara Africa, and are key to providing access to economic and social opportunities. Yet the majority of road networks in Ghana and other countries in Sub-Sahara Africa are not geographically referenced, to facilitate their uses for road maintenance and management, transport planning, emergency services, disaster cases, logistics, tourism and other location based services. Consequently, this study takes advantage of paratransit service and the location of landmarks to provide location addressing of road networks in Ghana. The paratransit service, popularly known as Trotro in Ghana is a local transit system that uses an automobile to move people and goods along a prescribed travel route on a road network, with locally known stops where people get on and off the vehicle. The Trotro service is popular in Ghana, yet there is no critical investigation demonstrating its spatial coverage, relevance as a credible location addressing for road networks, or as a comprehensive location data for location based services. This study provides evidence for this case, and investigates the spatial coverage of road networks used by the Trotro vehicles, and the mapping of their service stops together with landmarks in the Asokore Mampong Municipality (AMM) of Ashanti region in Ghana. It was found that the location data from both Trotro service and landmarks covered about 86% of the entire road network in AMM; providing a large coverage of the road network and greater geographic detail. A service area estimation undertaken using the generated location data shows a high geographic accessibility, with travel distances as low as 160 m from any location to the nearest Trotro service or landmark covering about 80% of the road networks. These results show the capability of the generated location data to tackle the problem of spatially unreferenced road networks, and to significantly improve their effective uses. The popularity of paratransit in Sub-Sahara Africa means that this study can be adapted to other countries where the majority of the road networks are not spatially referenced.     

Accessibility across transport modes and residential developments in Nairobi

A key goal of urban transportation planning is to provide people with access to a greater number of opportunities for interaction with people and places. Measures of accessibility are gaining attention globally for use in planning, yet few studies measure accessibility in cities in low-income countries, and even fewer incorporate semi-formal bus systems, also called paratransit. Drawing on rich datasets available for Nairobi, Kenya this analysis quantifies place-based accessibility for walking, paratransit, and driving using three different measures: a mobility measure quantifying how many other locations in Nairobi can be reached in 60 min, a contour measure quantifying the number of health facilities that can be reached in 60 min, and a gravity measure quantifying the number of health facilities weighted by a time-decay function. Health facilities are used because they are an essential service that people need physical access to and as a representation of the spatial distribution of activities more broadly. The findings show that place-based accessibility is highest for driving, then paratransit, then walking, and that there are high levels of access to health facilities near the Central Business District (CBD) for all modes. Additionally, paratransit accessibility is comparatively better in the contour and gravity measures, which may mean that paratransit is efficiently providing access based on the spatial distribution of services. The contour measure results are also compared across different residential levels, which are grouped based on neighborhood characteristics and ordered by income. Counterintuitively, the wealthiest areas have very low levels of place-based accessibility for all modes, while poor areas have comparatively better walking access to health facilities. Interestingly, the medium low residential level, characterized in part by tenement apartment buildings, has significantly higher accessibility than other residential types. One way to reduce inequality in access across income groups is to increase spatial accessibility for the modes used by low- and middle-income households, for example with policies that prioritize public transport and non-motorized travel, integrate paratransit with land use development, and provide safe, efficient, and affordable options.     

Comparison of efficiency between public and private transport modes using excess commuting: An experience in Dar es Salaam

The excess commuting concept is well-known in developed countries. Since the introduction of the concept in the developed countries, the excess commuting framework has been used to derive a set of benchmarks and indices for the analyses of spatial mismatch, jobs-housing balance, and commuting efficiency in urban regions. However, there are very few studies which have examined excess commuting parameters in relation to mode of transport in the current excess commuting literature. Additionally, very few studies on excess commuting have been undertaken in developing countries with no evidence on any study in African cities. This paper attempts to add to the excess commuting literature by examining and comparing excess commuting parameters between public and private transport modes in Dar es Salaam city. The study investigated the effects of land use patterns in the year 2007 (the base year) and the projected land uses in the year 2030 on excess commuting parameters. The results suggest that public transport in Dar es Salaam is very good in terms of providing excellent options to get everywhere in the city as it connects homes and jobs as well as private transport. This is very different from cities in the more developed world, especially in the USA, where public transport is less effective at connecting origins and destinations. It was also found that the land use scenario in the year 2030 encourages a travel pattern that increases the actual average travel distance.     

Characterizing the movement patterns of minibus taxis in Kampala's paratransit system

Urban travelers in Africa depend on minibus taxis for their daily social and business commuting. This paratransit system is loosely regulated, self-organizing, and evolves organically in response to demand. Our study used floating car data to analyze and describe the movement characteristics of nine minibus taxis in Kampala, Uganda. We made three intriguing findings. Firstly, in searching for, picking up and transporting passengers, minibus taxi trajectories followed a heavy-tailed power-law distribution similar to a “Lévy walk”. Secondly, their routes' topology and shape gradually changed. Thirdly, the extraordinary winding (expressed in terms of tortuosity) of the paths suggested the extreme determination of the drivers' search for passengers. Our findings could help city planners to build on the self-organizing characteristics of the minibus taxi system, and improve the mobility of travelers, by optimizing routes and the distribution of public amenities.     

Job growth,accessibility, and changing commuting burden of employment centres in Melbourne

How transport and employment agglomeration enhance urban productivity is a fundamental problem for many cities. Internationally, there has been a great deal of interest in the effect of employment concentration on urban productivity, but very few studies have examined its effect on worker commuting burdens and transport costs. This paper aims to advance international knowledge by measuring job growth and costs of labour market access between 2011 and 2016 for employment centres (EC) in Melbourne, Australia. A comprehensive transport cost model is used that incorporates detailed transport costs and travel times associated with transport modes. By tracking job growth and changes in worker commuting burdens, this paper distinguishes ‘high-cost’ ECs from ‘low-cost’ ECs, for their respective labour pools, and identifies which ECs offer opportunities for better transport outcomes. The results show that well-planned public transport (PT) systems and residential development, coupled with walking and cycle networks, are important features of ECs experiencing lower commuting burdens. Drawing upon the conclusions, this research recommends more effective approaches by governments to foster effective investments in urban infrastructure and discusses how broader policy and investment decisions can align to optimise employment agglomeration and minimise negative transport impacts.     

Minibus taxis in Kampala's paratransit system: Operations,economics and efficiency

Most cities in sub-Saharan Africa rely for their public transport on paratransit in the form of fourteen- to twenty-seater privately owned and mostly old minibus taxis. The system is often seen as disorganized, unregulated and inefficient. To assess the accuracy of this picture, we analyzed the operations and economics of Kampala's minibus taxi system and its efficiency from the passengers' and the drivers' perspectives, using ‘floating car data’. We found that the picture is largely accurate. Our findings suggest the need for moderate transformation: adequate enforcement of regulations, reorganization of ownership, renewal of fleets, and integration of ICT systems to facilitate scheduling, booking and fare collection. This will help to make the system safer, cleaner and more efficient for Kampalan commuters and more stable, secure and profitable for the minibus taxi drivers and the mini industries that depend on them.     

日本铁路“东京都市圈通勤五方面作战”转型服务启示研究

城市化进程中需要解决的一个关键问题,就是为特大或超大城市所形成的都市圈构建轨道通勤体系,不仅城市自身需要加快建设城市轨道交通和市郊铁路,以国家铁路为主体的大铁路转型都市区通勤服务也不可或缺,这对特大超大城市和国铁系统双方都是艰巨挑战,同时也是重要发展契机。日本国铁从1960年代后期开始,实施了以大力强化干线通道、提高通勤能力、缓解乘车拥挤为目标的"东京都市圈通勤五方面作战"取得显著成效,同时推动诸多民营铁路共同加快东京都市圈通勤系统建设,这些研究为形成都市圈"四网融合"的轨道交通网络提供重要借鉴。     

Measuring individuals' travel behaviour by use of a GPS-based smartphone application in Dar es Salaam,Tanzania

A range of mega-cities in the Global South have started to invest in Bus Rapid Transit (BRT) systems, as a complement or replacement for informal paratransit services, in an effort to improve the mobility and accessibility in the city. Yet, few studies have tried to analyse the impact of such systems on the mobility patterns of cities' residents, in part because traditional travel diary surveys are often too expensive to conduct and unsuitable to capture spatial mobility patterns in fast growing cities with a high level of informality in spatial development. In this study, we analyse the applicability of a new method of data collection, i.e. a GPS-based smartphone application, to capture individuals travel behaviour in fast growing mega-cities in the Global South. Our case study is the city of Dar es Salaam (DES) in Tanzania, where the first BRT line is currently being implemented. In our study, the GPS-based app was used by individuals in DES to record distances, departure times and destinations of their trips. Socio-demographic data of respondents were recorded in short questionnaires. The spatial distribution of the trip patterns shows the mobility demand in both high and less connected areas. The results reveal a variation in departure times, travel destinations and trip distances that are one the one hand spatially limited within neighbourhoods and away from the planned BRT, and on the other hand along major roads connecting to the Central Business District (CBD). The short average distances of the trips (<3 km) reveal the characteristics of paratransit modes. The GPS-based smartphone application provides an opportunity to policy makers to engage deeply with the spatial reality of local communities, as a basis for transport investments and policy improvements as steps towards an integrated public transport system.     

Accelerating sustainable mobility and land-use transitions in rapidly growing cities: Identifying common patterns and enabling factors

Urban growth has been increasing rapidly across the globe, in particular in low and middle-income developing countries. As city populations and GDP per capita rise exponentially, cities tend to experience similar challenges related to urban development and transport/mobility.One of the most problematic issues emerges when urban growth drives car-oriented urban development. This is characterised by a range of unsustainable patterns such as low-density development, urban sprawl, lack of plans and infrastructure to accommodate collective transport and active travel, and significant efforts and investments to meet the demand for private motorised vehicle use. For emergent cities, the risk is that these developments lead to highly inefficient, unhealthy and unsustainable urban systems that are difficult to remedy.This paper aims to identify recurrent governance and policy factors across sectors, as well as macro factors, that tend to contribute to car-dependent urban mobility systems in rapidly growing cities. It draws on qualitative and quantitative research findings from five under-researched Eastern European and Middle Eastern cities: Tallinn, Bucharest, Skopje, Adana and Amman. Data examining the evolution of urban mobility in these cities were collected as part of the Horizon2020 EU funded project CREATE.The paper investigates the extent to which car-dependent urban development processes can be avoided in rapidly growing cities, to support transitions towards liveable and sustainable cities. Finally, it provides policy recommendations targeting growing cities with low levels of car-use, in particular in Sub-Saharan Africa. It highlights the importance of acting swiftly to achieve targets such as the Sustainable Development Goals, the New Urban Agenda or the Paris Agreement, by supporting policies fostering efficient, sustainable and inclusive urban mobility and land-use across sectors and levels of governance.     

The jobs–housing relationship and commuting in Beijing,China: the legacy of Danwei

China’s market-oriented reform has not only revitalized the economy but also changed the physical structure of Chinese cities, which used to be largely determined by the socialist Danwei (or work unit) system. In order to understand the impacts of the reform and the influence of Danwei on jobs–housing relationships and commuting behavior, this study investigates whether there are differences in commuting behavior between individuals who live in houses provided by Danwei and those who reside in houses from private market sources in urban China. We apply the structural equations model to investigate the interactions between housing source (from Danwei or not), jobs–housing relationship, transport mode and commuting time in Beijing, the capital city of China. The results show that Danwei housing commuters have shorter commuting trips and higher usage of non-motorized transport mode than those who live in houses from the market sources. This finding implies that the diminishing influence of the traditional Danwei system and the market-oriented reform in urban development may have changed the jobs–housing balance and increased travel demand in Chinese cities.     

“产城融合”模式下准东开发区通勤轨道交通规划布局方案研究

准东开发区"产城融合"要求产业区与生活服务区空间布局合理,通过高效的轨道交通系统,实现职工的通勤需求。基于准东开发区"产城融合"模式、准东开发区及周边县市现状、交通发展状况,分析通勤旅客出行特征及存在问题。依据客流量预测结果、交通方式选择,结合准东开发区通勤轨道交通规划目标及布局,提出通勤轨道交通规划布局方案,有利于提升准东开发区与周边县市交通功能,改善开发区与周边县市的出行条件,压缩准东开发区和周边县市生活区的时空距离。     

Supply and pricing strategies of informal rural transport providers

Informal paratransit operators using a range of vehicle types (including pickup trucks, small buses, and motorcycles) are a major provider of mobility in rural areas of the developing world. The paper describes a mixed method approach used to examine such operators’ decisions about vehicle deployment, route frequency, network organisation, and pricing in three rural districts in South Africa. New evidence is presented showing that the condition of rural roads (both paved and unpaved) affects the quantity and quality of public transport services provided, as well as the fares charged to passengers. This strengthens the case for judicious infrastructure investment as a way of improving rural access and livelihoods, and suggests how this might happen by way of leveraging better private sector responses. We also describe the emergence of a differentiated service hierarchy involving a variety of vehicle types suited to different operating conditions, and based on intentional coordination among operators of minibus and pickup truck (‘bakkie’) services. We argue that governments should promote such coordination and innovation in rural transport markets.     

Demand forecast,congestion charge and economic benefit of an automated highway network for the paris agglomeration

This article is based on the main results of a pre-doctoral dissertation (DEA) on transport done at the ENPC. The research is about an economic evaluation of an automated highway network in the Paris urban agglomeration in the Ile de France Region.To this end, an automatic highway network incorporated into the road network in Ile de France has been modelled by means of the AEL-Davis software. Moreover, a congestion charging system has been introduced in the modelling. The targeted date of this study is 2020 so projections of a demand for alternative car commuting were made for that period. In addition the phenomena of total generation were taken into account in the evaluation. In fact the stages of total generation distribution and assignment have been recalculated to cater for generated traffic.As a result, a marked improvement in the relation between supply and demand has emerged. Moreover, a slowdown in urban sprawl and an increase in the density of activities in smaller and greater suburban areas have been noted. The economic benefits of such an undertaking would approach 73,000 h saved per evening rush hour.The automatic highway network would lengthen commuting distances by 3.5% while reducing commuting time by 2.6%. Thanks to the highway alone covering 2% of the entire infrastructure it would comprise 4.3% of total commuting distance in only 1% of commuting time. It would moreover increase the average commuting speed by 6.3%.     

Using metro smart card data to model location choice of after-work activities: An application to Shanghai

A location choice model explains how travellers choose their trip destinations especially for those activities which are flexible in space and time. The model is usually estimated using travel survey data; however, little is known about how to use smart card data (SCD) for this purpose in a public transport network. Our study extracted trip information from SCD to model location choice of after-work activities. We newly defined the metrics of travel impedance in this case. Moreover, since socio-demographic information is missing in such anonymous data, we used observable proxy indicators, including commuting distance and the characteristics of one's home and workplace stations, to capture some interpersonal heterogeneity. Such heterogeneity is expected to distinguish the population and better explain the difference of their location choice behaviour. The approach was applied to metro travellers in the city of Shanghai, China. As a result, the model performs well in explaining the choices. Our new metrics of travel impedance to access an after-work activity result in a better model fit than the existing metrics and add additional interpretability to the results. Moreover, the proxy variables distinguishing the population seem to influence the choice behaviour and thus improve the model performance.     

Urban structure,commuting burden,and employment status of labour forces in an Australian city

Understanding the productivity effects of worker commuting burdens is essential for appraisals of urban planning and investment strategies designed to improve urban productivity. However, the extant urban planning literature lacks systematic analysis of the influence of commuting costs on labour mobility, employment engagement, and productivity. This paper provides the first ever detailed analysis of mobility and commuting burdens for workers in a range of industries and occupational groups in Melbourne, Australia. Linking commuting burdens and measures of employment status in urban areas, this paper finds that the labour force in areas experiencing high commuting burdens exhibit lower levels of engagement with job markets. This research further reveals important variations in such relationships across diverse industry and occupation groups. The results provide urban policy makers with better information about urban transport and employment patterns, thus enabling them to investigate alternative approaches to investing in housing and transport infrastructure to reduce worker commuting burdens and improve economic performance.     

Spatial-modal scenarios of greenhouse gas emissions from commuting in Hong Kong

Transportation is a major source of greenhouse gas emissions in cities. Multiple strategies including green technologies, transport management, urban planning and behavior changes are required to mitigate transport emissions. This paper aims to introduce an analytical framework to investigate the impacts of different spatial-modal strategies on reducing commuting emissions. Based on the optimization approach of excess commuting, the proposed framework incorporates the minimum, maximum and random (unpredictable) travel outcomes to inform planning of an urban form embedded with fewer emissions. This analytical framework is applied to Hong Kong to estimate the emissions ranges (the minimum and maximum amounts) under 42 spatial-modal scenarios - a combination of six spatial strategies (status quo, monocentric, highly polycentric, moderately polycentric, dual-centric and tri-centric) and seven modal strategies (status quo, pro-rail (high), pro-rail (moderate), pro-bus (high), pro-bus (moderate), pro-car (high) and pro-car (moderate)). The findings illustrate the emissions impacts if Hong Kong is further developed following a job concentration or decentralization principle. It also indicates that if Hong Kong is reconstructed to be a city with multiple CBDs, a dual-centric strategy is desirable because both minimum and maximum commuting are shorter than that of a tri-centric strategy. Moreover, the modal strategy to actively promote rail usage shows more impacts on emissions reduction and car usage should be maintained at the current level. If commuter's travl is less predictable, the high rail usage under a dual-centric city form is a more sustainable spatial-modal strategy. The proposed analytical framework of city's commuting emissions affected by structural and modal changes is transferrable to other places and could offer planners different benchmarks of travel pattern to substantiate their sustainable city planning vision.     

Beijing: urban transport issues in a socialist Third World setting (1949–1992)

Post-1949 development of urban transport in Beijing, the national capital of the People's Republic of China, has been for a long time shaped by the ideology of the Chinese communists, in a setting of rapid urban growth and industrialization with general neglect of the ‘consumption’ needs of the urban populace. The Old City of feudal Beijing which the municipality inherited in 1949 and the need to preserve its pre-industrial street pattern, set by the city wall and the former Imperial Court (the Forbidden City), for historical and cultural reasons added another interesting and almost insurmountable constraint to the city's urban transport development.This paper provides a comprehensive analysis of the situation and development of urban transport in the city from 1949 to 1992, outlining its major characteristics and problems. The effects of the new Open Door and modernization policies since 1978 and their impact on a new approach emphasizing market forces are evaluated. Wherever feasible, comparative figures and materials from the western and Third World city are used to provide better appreciation of Beijing's situation. The experience of the new policy of Market Socialism that started in 1978 provides valuable evidence for other large Third World cities.     

The dynamics of modal shifts in (sub)urban commuting: An empirical analysis based on practice theories

A modal shift away from the private car onto low-carbon transport modes is an essential part of decarbonising the transport sector. The dynamics of modal shifts are, however, not yet well understood. In particular the interrelations between structural and individual dynamics require further investigation. Furthermore, a better understanding is needed of how new transport modes become integrated into existing mobility practices. In this article, we address these questions in a qualitative study of modal shifts in (sub)urban commuting in three major Swiss cities. We analysed the interview data by means of a qualitative content analysis informed by practice theories. We found that modal shifts can arise i) from dynamics related to the conditions of use of different transport modes, ii) the coordination of everyday mobility with other people, iii) the coordination of resources between different daily practices, and iv) from dynamics related to the intrinsic motivation of everyday mobility. We found that these different dynamics are intertwined and that to understand how modal shifts arise, they must be analysed conjointly, rather than in isolation. And we identified three patterns in how modal shifts play out, and which describe different ways in which the new transport mode becomes integrated into everyday mobility practices. The first pattern describes modal shifts which require no adaptation of existing commuting practices. The second pattern describes modal shifts after which a new everyday mobility routine must be built. And the third pattern describes modal shifts that coincide with a lifestyle change. We conclude by discussing the implications of our findings for decarbonising everyday mobility.