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FLEXIBLE PAVEMENT DESIGN<br />
LEVELS OF RELIABILITY<br />
AASHTO 93<br />
FUNCTIONAL<br />
CLASIFICATION<br />
INTERSTATE<br />
AND OTHER<br />
FREEWAYS<br />
PRINCIPAL<br />
ARTERIALS<br />
LEVEL OF RELIABILITY<br />
URBAN RURAL<br />
85 – 99.9 80 – 99.9<br />
80 – 99 75 – 95<br />
COLLECTORS 80 – 95 75 – 95<br />
LOCAL 50 - 80 50 - 80