| 摘要 |
The element has a U-shaped structure (1) comprising a lower horizontal wall (3), which forms a slab on which the vehicle is adapted to move. Two side vertical walls (4) are adapted to laterally frame the lane, where each lateral wall bears a horizontal plate (5) at a free end. A lower structural element (24) i.e. rectangular or trapezoidal box is carried by the lower horizontal wall, where the element and the structure are formed from a single piece. Width of the lower structural element is lesser than that of the U-shaped structure. |
