| 摘要 |
A security device arranged along traffic lanes has, along the traffic lane, a vertical lower surface (1) of which the upper edge forms an edging (2) of a height smaller than that of a conventional tyre connected to an upright surface (3) and to a prominent returned border (4) arranged at a height such that it is intended to act onto the vehicle underneath the body. From the edging (2), the surface (3) extends at least up to the point of vertical protection (5) of said returned border (4) with an increasing slope and said point (5) is located in the central third portion of the vertical distance between the edging (2) and the lower part of the returned border (4). The mean slope of the surface (3) between the edging (2) and the point (5) is approximately 45`, the slope at the projection point (5) being 60` approximately. |
