Determine the minimum radius of a horizontal curve required for a highway if the design speed is 70 mph and the superelevation rate is 0.08.

1819.4 ft

Explanation:

Let us assume  the coefficient of side friction is 0.10

The radius of curve is given by the formula:

Where R is the minimum radius of a horizontal curve, V is the speed, f is coefficient of side friction and e/100 = super elevation rate, g =acceleration due to gravity

Given that:

V = 70 mph = (70 * 1.467) ft/s = 102.69 ft/s, g =32.2 ft/s², e/100 = 0.08, f= 0.1

the minimum radius of a horizontal curve is 1819.4 ft

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