| 摘要 |
PROBLEM TO BE SOLVED: To prevent the overturn or breakage of a protective barrier for a road, to facilitate its recovery, to smoothly guide vehicles at night, to improve safety, to prevent the effect of road illumination on the plant ecology along the road, and to reduce the maintenance cost of a road illumination facility. SOLUTION: Multiple concrete protective barrier blocks 1 having tensile steel product insertion through holes 2 are connected by a tensile steel product 3 with tensile force applied. Notched recesses 6 of a proper shape are provided at prescribed intervals on the wall faces of the concrete protective barriers 1 on the vehicle traveling side, and luminaires 8 for illuminating the road surface are inserted and installed in the notched recesses 6.
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