| 摘要 |
PROBLEM TO BE SOLVED: To provide a safety facility for informing a vehicle climbing on the sloping road from this side of the condition of a far side in the neighborhood of the top of a mountain path-like road. SOLUTION: The condition of the far side of a mountain path is mirrored on the face of this side of a prism system refracting body (1) by providing the prism system refracting body (1) in the neighborhood of the mounting path. |
