| 摘要 |
PROBLEM TO BE SOLVED: To provide a tunnel having an inner wall face formed with a pattern for safe travel. SOLUTION: Strain feeling and stable feeling of a traveler traveling in an inside of a tunnel are properly regulated by forming the pattern of the inner wall face of the tunnel for the safe travel including the first pattern layer 10 formed lateral-directionally along a vehicle traveling direction on the inner wall face of the tunnel, and the second pattern layer 20 formed lateral-directionally contacting with an upper part of the first pattern layer 10, and having a lightness different from that of the first pattern layer 10, speed sensing ability and travel safety are enhanced thereby, and an effect of preventing various accidents in the tunnel is expected as a result thereof. COPYRIGHT: (C)2010,JPO&INPIT
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