CFR
- Title 1 - General Provisions
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170.455—How are design standards used in IRR projects?
The standards in this section must be applied to each construction project consistent with a minimum 20-year design life for highway projects and 75-year design life for highway bridges. The design of IRR projects must take into consideration:
(a)
The existing and planned future use of the IRR transportation facility in a manner that is conducive to safety, durability, and economy of maintenance;
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