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**Mumbai university > civil engineering > sem 5 > transportation engineering 1**

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Design the rate of superelevation for a horizontal highway curve of radius 300 m and speed 80 kmph

written 2.9 years ago by | • modified 2.9 years ago |

**Mumbai university > civil engineering > sem 5 > transportation engineering 1**

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written 2.9 years ago by |

V = 80 kmph , R = 300 m

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

$e = \frac{V^2}{225R} = 0.094$

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

$f = \frac{V^2}{127R} - 0.07 = 0.097$

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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