| 摘要 |
Each element 1, 1', 1'' has, at one end 2, a thickness equal to the height of a pavement with, in its lower face, a sunk recess 4, the length being equal to the width of a traffic lane on a road, one type of element 1 having a constant thickness, one type of element 1' having part of its upper face as an inclined plane 17 and one type of element 1'' having a convex longitudinal edge 9'. <IMAGE>
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