The report described a study undertaken to show the benefits that Autoguide could achieve in London. The assessment of the benefits of the system was undertaken by selecting a random, but representative, set of actual journeys and comparing the journey time for these journeys with viable alternative routes. In order to obtain information on existing journeys in London, some 120 randomly selected drivers were asked to complete journey logs giving details of all journeys made in one week. From the information received in the journey logs, 100 trips having part or all of the route within the M25, were selected. The Routetel program, based on off-peak historic journey times, was used to generate alternative routes between each origin and destination. These routes were generated on the basis of minimum time, behavioural cost, resource cost and distance. Only origin/destination pairs having viable alternative routes were selected for survey. Each route and its alternative were driven simultaneously each weekday at the same time for one week. Incidents such as traffic congestion were recorded, as was travel time. The benefits were measured in terms of time and resource costs for 4 vehicle/purpose classes for two time periods (peak and interpeak). Separate analyses were undertaken for those journeys travelling on the proposed Autoguide network and those trips using links off the proposed Autoguide network. The results and conclusions of the study were provided. See also IRRD 820243 and 820244.

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