Abstract
Maintenance and management of road network as public asset across the nation at low cost is urgent and vital. Repair costs can be reduced if the slight deterioration on the road surface is detected in early stage, and the construction period can be shortened. In this report, a measuring system using acoustic signal emitted by tire-road contact is disclosed as a potential solution for this. The system has a microphone in a tire cavity that sends signal via radio wave to a receiver/controller on board while driving on road. This system is affected neither by the vehicle vibration characteristics nor by rain or dust. This system enables us to collect road surface roughness data covering the whole road system twenty-four hours by a number of privately owned vehicles instead of special vehicles. The results both on a chassis dynamometer and actual roads are disclosed.
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