The National Highway No. 25, which is a exclusive motor-vehicle way with many heavy vehicles, has a descending sharp curve in the Maitani District, and overshooting accidents are very frequent. For this reason, various measures have been taken such as installing decelerating signs, faulting pavement, warning signs, and porous asphalt pavement. AHS supports pro-active driving by providing information in advance, which cannot be done by conventional measures.
The Maitani District was selected as a site for testing AHS, which provides 1) information according to the driving conditions when approaching the curve, and 2) real-time information about the blind curve. The test examines the convenience of the system for drivers, and the functions and performances of the system.
Principal verification items
- Examining the difference in effect between one-time and two-time provision of the information of a standing or slow vehicle
- Examining the differences in service effect between information board and on-board unit
- Conducting surveys on drivers asking whether the services are effective
- Examining the difference in the percentage of service recognition between information board and on-board unit
- Verifying the safety and reliability of road condition detection sensors and the entire system
- Evaluating the effects of radio interference and cutoff under real on-road conditions
Example of proving tests on actual roads: Maitani District
