ABSTRACT
Throughout Japan the road surface condition of expressways is monitored on regular basis. IRI is used as a measure of road roughness and visual inspection by expressway patrol teams is used to check for emergency road damages. Inspection using IRI is carried out every two years. When emergency road damages, such as potholes, are detected by expressway patrol teams, emergency repairs are executed as soon as possible. In addition to IRI and visual surface inspection, some customers lodge complaints about the trafficability of the expressways. In this study, damage probability of road pavement was evaluated using inspection result data between each interchange along an expressway. The relationship between damage probability and customer feedback for trafficability was also considered.
