Question: A new interstate highway is being built with a design speed of 7 0 mi / h . For one of the horizontal curves, the

A new interstate highway is being built with a design speed of 70 mi/h. For one of the horizontal curves, the radius (measured to the innermost vehicle path) is tentatively planned as 2500 ft. Assuming a friction factor of f_s=0.10, what rate of superelevation is required for this curve?

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