Determine the design speed and length of the curve

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Reference no: EM13299116

A horizontal curve is designed for a two-lane road in a mountainous terrain. The following data are known:

Deflection angle: 40 degrees

Tangent: 436.76

Station of PC: 2695 + 73.89

Side friction factor = 0.12

Superelevation = 8%

Superelevation run-off rate = 1:400

Lane width = 12 ft

Normal crown slope = 2%

Determine the following:

Design speed
Length of the curve
Degree of the curve
Stations of the PI and PT
Station of superelevation runoff begins
Station of tangent runout
Station where the curve is fully superelevated
Station where the superelevation is 3%

Reference no: EM13299116

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