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Inter-temporal variations in values of time in Great Britain

National value of time (VOT) studies provide a valuable source of information regarding the attitudes and preferences of travellers. Countries suchas Britain, The Netherlands, Sweden, Switzerland, Norway and Denmark haveall conducted national studies and have used their results in the appraisal of both major and minor transport-related projects. While the importance of these studies is clear, less emphasis has been placed on researching how respondents attitudes to and valuations of transport-related attributes change over time. This is a crucial area of investigation as the costly nature of these national studies means that there will typically be some years between studies, if they are repeated at all. It is important be surethat the results of these studies are valid over a number of years and therefore need to know if and why attribute valuations change. This study isan attempt to address this issue. During the course of the current study of M6 Toll (M6T) users the opportunity was taken to conduct a reduced-scale repeat of the 1994 UK study. Questionnaires were distributed to motorists at seven motorway service areas (MSA) in the West Midlands region. The MSA sites were chosen to maximise the possibility of getting in-scope (i.e.those who could use the M6T road) respondents for the main study. Those who were not in scope were handed a version of the repeat study questionnaire. The questionnaires used in the repeat were nearly identical to those used in the original 1994 study. The main difference was that income bands and cost levels in the stated preference (SP) experiments were uplifted inline with inflation. Each questionnaire asked the respondent to provide information relating to their current trip purpose, trip characteristics and socioeconomic data. In addition they were asked to complete three SP experiments. Two of these SP experiments were given to all respondents. The first involved a choice between two unlabelled routes defined by journey time and travel cost. The second involved a choice between a tolled and untolled route, this time defined by journey time and travel/toll cost. In addition respondents were given a third SP experiment, which differed according to the length of the journey they were undertaking on the motorway. Forsome individuals, the SP experiment involved a route choice that includedroad characteristics (coach/lorry access, number of lanes, hard shoulder). For others the third SP experiment involved a route choice based on departure time. Finally, others were given an SP experiment that included a chance of delay attribute. The questionnaire distribution was carried out over four weeks in November 2006. Individuals were handed one of these questionnaires and asked to complete them once they had completed their currentjourney. In total, 1399 questionnaires were returned. This compares with 1129 motorway questionnaires returned in the original 1994 study. The original 1994 study looked at variations in the value of time due to factors such as trip purpose/user type, journey length/characteristics and gains and losses on the current situation. Intentions for the analysis of the dataare provided. For the covering abstract see ITRD E137145.

  • Authors:
    • TAPLEY, N
    • WARDMAN, M
    • GUNN, H
    • HYMAN, G
  • Publication Date: 2007

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01100019
  • Record Type: Publication
  • Source Agency: TRL
  • Files: ITRD
  • Created Date: May 27 2008 9:27AM