Determine the minimum radius of a horizontal curve required for a highway if the design speed is 60 mi/h and the superelevation rate is 0.08.
What will be an ideal response?
First, determine the coefficient of side friction, fs, from Table 3.3. fs = 0.12
Next, use Equation 3.34 to solve for R.
R = u2 / 15(e + fs)
R = [(60)2 / 15(0.08 + 0.12)
R = 1,200 feet.
The minimum radius for this curved section of roadway was found to be 1200 ft.
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