Abstract
This study quantitatively evaluates effects of trip reservation systems that adjust departure times of travelers on motorways in a similar way to train seat reservations. A stated-preference survey was conducted at a service-area on a motorway. About 1, 500 survey sheets were distributed there, and about twenty percent of which were mailed back. Parameters of an logit-model that includes socio-economic, trip and trip-reservation related attributes of travelers were identified based on the SP survey. The effect of the trip-reservation on the mitigation of the traffic congestion is to be quantitatively evaluated by numerical simulation with the model and observed data on actual traffic congestion.