In Japan, a real-time incident detection and warning system installed on a dangerous curve on the Hanshin Expressway decreased the rate of secondary crashes by 50 percent.

October 1997

Summary Information

TV cameras were installed at Awaza curve on the Hanshin Expressway to automatically detect disabled vehicles and those involved in accidents by processing their image.


The system reduced the time required to provide information to trailing vehicles from 8 minutes to 2 seconds. Consequently, the rate of secondary accidents decreased to half of what it was before the system was introduced. A system was introduced that automatically detects unforeseen occurrences in tunnels by way of image processing. When the image processing device detects these occurrences, it displays warnings on an indicating device and makes available on-the-scene pictures recorded by the cameras.

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Intelligent Transport Systems Handbook in Japan

Published By: Highway Industry Development Organization, Ministry of Construction

Source Date: October 1997


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Benefit ID: 2007-00494