Which of the following is the minimum safe radius of a horizontal curve for a two-lane rural highway with a speed limit of 60 miles per hour (mph) and an 8% rate of superelevation? (Assume the coefficient of side friction = 0.12)

Question

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The minimum safe radius of a horizontal curve for a two-lane rural highway with a speed limit of 60 miles per hour (mph) and an 8% rate of superelevation is 1,200 feet. Solution: Use AASHTO Equation Rmin = V²/15(0.01e_max + f_max) Where V = 60 mph f_max = 8% R_min = 60²/15((0.01) (8) + 0.12)) = 1,200 feet

Which of the Following Is the Minimum Safe Radius of a Horizontal