เกาะกลางถนน (Concrete Barrier) มาตรฐานกรมทางหลวงชนบท 2564
Precast concrete median barrier to the Department of Rural Roads 2021 (B.E. 2564) standard, single-slope Type A.
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Barrier rubber fender
Single-slope concrete barrier for fitting natural-rubber fenders, to Department of Rural Roads special standard 2/2563, 3 m long.
