| 摘要 |
PURPOSE: A groove is provided to effectively prevent a vehicle from slipping by expanding the area of the groove formed on a road. CONSTITUTION: A groove(10) is horizontally or vertically formed on a road. The groove is formed in a trapezoidal shape. The top end surface(a) of the groove is longer than the bottom end surface(b). The length of the top end surface is 3~500 mm. The length of the bottom end surface is 2~200 mm. The depth of the top end surface is 2mm, and the depth of the bottom end surface is 15mm. |
