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Highway Superelevation

Superelevation is the banking of roads through turns so that the lateral forces on the vehicle balance out with the centrifugal force during the turn. Proper superelevation will allow a vehicle to safely turn at high speeds and will make riders comfortable.

From the AASHTO Green Book:

Urban areas the maximum superelevation is 4% to 6%.

Ice and snow areas the maximum is 6% to 8%.

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