To update the traffic image processing system for the Nihonzaka tunnel on the Tomei Expressway as ordered from Central Nippon Expressway Co., Ltd., Sumitomo Electric Industries, Ltd. completed the manufacture, installation and adjustment of system equipment. The system formally commenced operation in April 2008.
Sumitomo Electric has extensive experience in constructing tunnel traffic image processing systems to automatically detect abnormal vehicle motion by processing images sent from cameras installed in tunnels. Such systems constructed by Sumitomo Electric are already operating in 30-odd tunnels, including the Chuo Expressway’s Enasan tunnel and the Shinjuku Gyoen tunnel on National Route 20. The Nihonzaka tunnel consists of three tubes for up and down lanes, with a total of 53 cameras installed in the tubes.
The renewed image processing system for this tunnel employs an image-processing board newly developed by Sumitomo Electric, which enables the system to promptly recognize individual vehicles from images sent by the cameras and automatically detect abnormal vehicle motion, such as stopping, low-speed driving, traffic jams and frequent lane-changing, based on image data. This will help road surveillance personnel detect abnormal vehicle motion in the tunnel to high accuracy, thereby preventing rear-end collisions and secondary accidents inside tunnels.
Sumitomo Electric will continue to do its best to help create a safe traffic environment.