Review of Service Quality Valuations



Review of Service Quality Valuations

Authors

WARDMAN M, University of Leeds, UK

Description

The research reported here extends the review of British evidence relating to in-vehicle time (IVT) values reported in Wardman and Maekie (1997) and Wardman (1998a) to include valuations of the following variables:

Abstract

The research reported here extends the review of British evidence relating to in-vehicle time (IVT) values reported in Wardman and Maekie (1997) and Wardman (1998a) to include valuations of the following variables:

* walking and access time

* waiting time

* search time

* late time

* departure time adjustments

* delay time

* public transport headway

* public transport interchange

The values of wait time and headway are quite distinct whilst interchange relates solely to the need to change train or bus during the course of a journey. Search time is the amount of time spent locating a parking space, departure time adjnslments represent differences between actual and ideal departure times whilst delay time represents time spent driving in congested traffic conditions. Access time covers the time spent accessing public transport including walking where it is combined with other forms of access.

The aim of the research was to review how the values of these time and service quality attributes vary according to key soeio-eeonomic and trip characteristics. Two approaches were adopted. Inter-study analysis concentrates on variations in valuations across studies, exploiting the large amount of empirical evidence that is available. Intra- study analysis examines variations in valuations that are apparent within studies, thus providing a greater control of extraneous influences but at the cost of much lower sample sizes.

One of the recommendations of our previous review was that it should be extended to cover other aspects of travel time and service quality. The value of IVT has tended to receive much more attention than other attributes (CEC, 1994; Steer Davies Gleave, 1997; Wardman, 1998a; Waters, 1995). Walk and walt time are often included alongside reviews of IVT evidence but in lesser detail (CEC, 1994; MVA et al., 1987), although a notable exception is the review of walk time values by Axhausen and Polak (1991). We are not aware of an extensive review of the values of the other attributes covered in this study.

Publisher

Association for European Transport