TUNNEL IN AUTOMOBILE ROAD, AND TUNNEL ENTRANCE PROTECTIVE WALL AND EXIT PROTECTIVE WALL

摘要

PROBLEM TO BE SOLVED: To provide a tunnel, and a tunnel entrance protective wall and a tunnel exit protective wall contributing to a relief of traffic congestion of vehicles.;SOLUTION: The protective walls 10, 12 are installed at an entrance of the tunnel 20 on both sides of a road 30. A width between the protective walls is about the same as the entrance width A of the tunnel at a tunnel adjoining part and about the same as the road width C of the road leading to the tunnel on the anti-tunnel side. The protective walls further comprises a roof, and illuminance outside the protective walls on the road continuously changes to illuminance in the tunnel within a range covered with the protective walls and the roof.;COPYRIGHT: (C)2010,JPO&INPIT