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Pages 7-8

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From page 7...
... 1 1 BACKGROUND On December 21, 2015, the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation Officials (AASHTO)
From page 8...
... 2 27-inch guardrail with 31-inch guardrail? Waiting until the 27-inch guardrail is "damaged beyond repair" may mean the guardrail stays in service for decades (1)

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