Question

design the rate of super elevation for a horizontal highway cure of radius 300 meter and speed 120 km/h

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Answer 1

Answer: V = 80 kmph , R = 300 m

For mixed traffic conditions, superelevation is designed for 75% of design speed

e=V2225R=0.094

As the value is greater than the maximum permissible superelevation of 0.07 kmph, the actual superelevation to be provided is restricted to 0.07

Check for coefficient of lateral friction developed for full speed (V) = 80 kmph

f=V2127R−0.07=0.097

As the value is less than 0.15, the design is safe with a superelevation of 0.07.

Therefore provide a superelevation of 0.07

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