Abstract
This paper studies drivers' travel behaviour in a road network degraded due to natural disasters. Actual route choice and travel choice behaviour of drivers using a questionnaire survey are analyzed. It is found that 85% of drivers did not cancel their trips and use diversion routes. Due to the insufficient supply of road networks, 70% of diverted drivers were obliged to use lower class of road sections with higher risk of travel. Models describing travel choice behaviour are developed using disaggregate demand modelling methods. Those models are applied to the road network in the Shikoku area. Although 3% ofdrivers are effected by road section closure, the estimated trip cancel rate and diversion rate are consistent with actual travel behaviour in the degraded network.
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