Objective Monitoring of the Benefits of Dynamic Route Guidance: Survey Methodology.

This paper is one of a series concerned with the SERC Rolling Programme on fundamental aspects of the performance of dynamic route guidance systems, and more specifically related to that strand of the programme which has been conducted in Berlin, in conjunction with the field trial of dynamic route guidance (LISB). This field trial has provided the opportunity to test methods, developed in an earlier study (May and Bonsall, 1988) for assessing the objective benefits gained by drivers receiving guidance. This paper describes the survey method for that study. A method was developed in which pairs of drivers, one with LISB guidanee and one without, travelled at the same time between the same origins and destinations. One set of journeys were those to and from work performed by participants who had been using LISB for some time, and who were paired with student drivers. The others were off peak journeys in the same corridors, travelled by student drivers in pairs.