The design speed for a National Highway is 100 kmph. If

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The design speed for a National Highway is 100 kmph. If the maximum permissible superelevation is 0.10 and the coefficient of lateral friction is 0.15, the ruling minimum radius of horizontal curve on the highway should be

1. 260 m
2. 315 m
3. 380 m
4. 410 m

Correct Option: B

e + f =	V²	( V in kmph , R is m)
	127R

0.1 + 0.15 =	100
	127 × R

∴R = 313 m