The impact of increasing levels of transport activity on the environment is one of the most significant challenges for sustainable development. The planning and evaluation phase of a potential infrastructure investment normally provides an estimation of its forecasted quantitative and qualitative effects. This helps decision makers to start or to reject the project. The estimation consists normally of cost benefit calculations and descriptions of other societal benefits. In order to make a positive decision to invest (the decision to start the transport infrastructure investment) more positive than negative effects and expectations need to be existing. The investment must be seen as beneficial for the city supporting the transport and mobility policy of society. The direct effects and impacts of the construction phase can be negative for the use of (public) transport system, if the construction work hinders the use of public transport (lack of service, poor replacement services, poor temporary connections etc.). The effects can be seen, e.g. in passenger statistics and in complaints concerning the construction phase. The construction phase can change the modal split at least temporarily if the former users of public transport shift to private car use (more private car users in the area where the construction work is done). From a marketing and public acceptability point of view, there is a need for minimising the negative impacts of any new transport system during the construction phase. For the covering abstract see ITRD E126595.
The premise on which this project is based is that informing the current policy debate and strategy development requires an insight into the consumer's decision making process and priorities in relation to lifestyle, rather than emphasis on simply the potential gains to be achieved from largely untested policy initiatives. Therefore, consumer response needs to be seen as central to any sustainable planning and transport policy initiatives. Consumer choice can be influenced by a variety of levers; most effectively those linked to some change in utility or cost rather than appealing to altruism. Belfast was the study area. It is a medium sized city, which has undergone a dramatic shift from public transport use to widespread car dependency, coupled with a massive out migration of people from the urban core. While Belfast may not be wholly typical, even of car dependent medium sized cities, it does offer insights into the challenge faced by policy makers, particularly those responsible for car dominated cities. The research indicates that public transport improvements lack credibility, while proposed road user charges and densification generate varying degress of resistance. However, despite general resistance to densification, there are signs amongst some respondents of an acceptance of moderately higher densities at discounted property prices. If incentives can be offered, for instance, by way of reduced housing costs, then selected market segments are likely to respond positively. The authors are currently reviewing the implications of these findings for planning guidance and local development control as well as development scheme viability. (A) For the covering abstract see ITRD E107063.
It is a feature of suburbanised towns and villages in the proximity of larger towns or cities, that the former patterns of rural travel behaviour change significantly. The nature of travel behaviour is mutable as a consequence of rural planning policy where small towns and villages are influenced by government area plans. Northern Ireland offers numerous examples of this phenomenon; and, as part of a wider investigation on sustainable development, this paper reports on a prototype study that assesses the pertinent views of residents within one suburbanised village under the remit of a defined area plan. Primarily, it describes the overall modelling strategy with an emphasis on: •differences, in respect of travel behaviour, between newcomers and established residents, and •pull factor weightings that illustrate why a suburbanised village is chosen by its residents. More particularly, the paper discusses the merits and demerits of using a simplified hierarchical cross impact technique in modelling the perception of residents in their choice of dormitory settlement. In supporting this technique, the application of the Gaussian neighbourhood consensus function (Dodd, 1993) is introduced as an opinion profiling device.
The consumer response to sustainable development initiatives provided the focus for a series of research projects undertaken at the Transport Research Institute at Napier University. Evidence of the relationship between residential density and travel behavior is presented. Results are presented from a large household survey undertaken in four settlement classes within one key commuter corridor of the Belfast City (Northern Ireland, United Kingdom) region to determine their comparative sustainability in terms of travel behavior. It can be concluded that wide-scale land use policies can achieve significant reductions in overall private vehicle travel in urban areas. Densification is best suited to established urban areas and for influencing modal shift primarily to walking rather than public transit. The work also suggests that a more focused approach to planning decisions reflecting housing market segment preferences could yield a win-win situation for house owners and developers, albeit at the expense of some reduction in residential plot size. Local changes can bring global benefits. A great challenge falls to the urban designer to ensure that such trade-offs do not unduly undermine quality of life. Further thoughts are provided on the implications for policy makers in car-dominated cities in the United States.
The search for sustainable urban forms represents a central component of the national and international debate to achieve the goal of sustainable development. The research reported in this paper focuses on two medium size cities, formerly with similar densities and travel patterns, but which now reflect either end of the car dependence spectrum in the United Kingdom. The modern form and nature of Belfast and Edinburgh are quite different in terms of density, mobility patterns and the characteristics of their transport infrastructure, and thus provide for a suitable comparative and exploratory analysis. The project included a lifestyles based household survey, of approximately 2,000 households in the two city regions and conducted in the Summer 2001. It also included a stated preference experiment. This examined the choices people make when buying or renting a property faced with a range of transport and land use initiatives typical of the sustainable development agenda. A business survey of 125 properties in the two city regions (65 in Edinburgh and 60 in Belfast) was also undertaken to ascertain business response to sustainable transport policy initiatives. A stated preference experiment examined the choices businesses make when buying or renting a property. This followed a similar format to the household survey stated preference experiment. In examining sustainable transport and land use policy links to economic development, the focus is on the links between urban form, travel behaviour and location preferences. Discrete choice modelling has been incorporated using the stated preference data. Further research and modelling developments, and the conclusions, are presented. For the covering abstract see ITRD E126595.
The emergence of concern about global sustainability raises questions about the nature of travel behaviour and its potential effect on the sustainability of households. This potential, generated through an understanding of what is meant by travel behaviour sustainability, must be addressed by way of education. The paper attempts to characterise this type of sustainability using a coarse multiattribute model that reduces the concept to five measurable attributes. These can be readily integrated with a public educational programme designed to enable households to assess and reflect on their behaviour as a result of a household sustainability index of travel behaviour. Results from a large survey of households in the Belfast City Region are presented to illustrate the tangibility of the modelling methodology (Belfast is the capital city of Northern Ireland).