Abstract
A methodological challenge is to develop methods which satisfy the need in transport planning of accurately forecasting travel behaviour. Drawing on a review of the current state of attitude theory, it is argued that successfully forecasting travel behaviour relies on a distinction between planned, habitual, and impulsive travel. Empirical illustrations are provided in the form of stated-response data from two experiments investigating the validity of an interactive interview procedure to predict household car use for different types of trips, either before or after participants were required to reduce use. (A)