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Road guard rails1/23/2024 ![]() Every piece of Gregory Highway guardrail is stamped with a brand registration that is repeated throughout the entire length of the rail. Our guardrail is manufactured to AASHTO specifications in M180 Class A or B, and finish types 1, 2, 3, or 4. Guardrail Radius Chart Functions of 12-ft., 6-in. The arc may not be consistent, and each consecutive piece of guardrail may differ in radius from the previous one. Note: Follow the steps above for each piece of guardrail section in the curved run. Example: A rise of 3-7/8'' would result in a radius of 60 feet.
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