6 мая 2024 г. · A thrie beam guardrail is a type of roadside barrier that is made of three steel beams. The top and bottom beams are “W” shaped, while the ... |
Thrie-Beam Guardrail Meets AASHTO Specifications. Our guardrail is manufactured to AASHTO specifications in M180 Class A or B, and finish types 1, 2, 3, or 4. |
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