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In the past, the driver can’t judge accurately whether the vehicle can safely pass a tunnel or a bridge opening. As a result, an accident is very likely to happen, especially when a driver is driving a truck fully loaded with goods.Once the vehicle drives into the measuring zone and its height exceeds the limitative height, the indicating light flickers thus giving a hint to the driver that driving passing the zone is forbidden. The indicating light can clearly convey the message to the driver so that the driver can make the right judgment. In this way, accidents are avoided and safety is guaranteed.