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Over-height warning device safeguards tunnel

A wireless warning and intercept system to prevent over-height vehicles from entering tunnels has been put into use at the Puxi Entrance of Jungong Road Tunnel where violations occur most frequently, reported today.

The Huangpu River tunnel, opened to traffic in January last year, connects the city's Yangpu and Pudong districts and is a major link of the Middle Ring Road.

Since its opening, more than 10 over-height vehicles have crashed into signboards and LED screens in the tunnel, causing severe losses. Tunnel management staff blocked another 40 or so over-height vehicles, said Yang Jinlong, manager of the tunnel's management team.

To prevent further accidents, sensors were mounted on an overhead frame on the Middle Ring Road, about 2.2 kilometers from the tunnel entrance, to detect over-height vehicles.

"Once an over-height vehicle passes, it will activate a red LED warning 500 meters away and four sets of tweeters to guide the driver to exit to Zhoujiazui Road," said Zhang Weijia, the engineer who designed the system.

"The warning will also alert the tunnel management team near the entrance so they can get ready if the vehicle continues toward the tunnel. The warning will automatically go off if the vehicle leaves," Zhang said.

Zhang said the management team will have 90 seconds to intercept a vehicle as the test assumed automobiles travel at 80 kilometers per hour.


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