SP Studies Among Travel Card Holders - a Methodological Problem and Test of Alternative Solutions



SP Studies Among Travel Card Holders - a Methodological Problem and Test of Alternative Solutions

Authors

SJOSTRAND H, University of Lund, Sweden

Description

Stated Preference studies are used to assess standard in public transport, based on passengers' willingness to pay. The studies are conducted under the condition that it's able to construct balanced hypothetical choices between standard and cost.

Abstract

Stated Preference studies are used to assess standard in public transport, based on passengers' willingness to pay. The studies are conducted under the condition that it's able to construct balanced hypothetical choices between standard and cost.

The monthly ticket holders have lower average costs per trip and no marginal cost per trip at all. Both their actual budget restrictions and their psychological situations are different from other passengers' situations as they have to make simultaneous decisions about larger expenses. This will affect both their actual assessments and how they react to hypothetical questions concerning fare changes.

Almost half of the bus passengers in local public transport, and in some cities even more, use monthly tickets, in SP-studies they often are treated together with cash paying passengers even though theytravel under obvious different circumstances. For example has trip cost been used during evaluation of public transport systems in Norway even for monthly ticket users (see f i KjSrstad, 1995).

The easiest and most practical way making a survey would be to give identical questionnaires to all respondents. But previous research tells us that validity of results is violated if the respondents don't find the alternatives realistic (Widlert, 1994).

In a computerised survey it is easier to customise the alternatives to the traveller's present conditions than in printed questionnaires. Widlert (1992) has adapted the fare levels such that the monthly cost was presented to people using monthly period cards. The computer then calculated a cost per trip depending on how many trips the passenger said they did per month. The passenger then had the ability to change this trip cost, if they didn't agree. The results indicate that assessments of standard are proportionate to travel cost rather than to travel time.

Publisher

Association for European Transport