The extra widening required for a two-lane national highway

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The extra widening required for a two-lane national highway at a horizontal curve of 300 m radius, considering a wheel base of 8 m and a design speed of 100 kmph is

1. 0.42 m
2. 0.62 m
3. 0.82 m
4. 0.92 m

Correct Option: C

Extra widening =	nL²	+	V
	2R		9.5√R

=	2 × 8²	+	100
	2 × 300		9.5√300

= 0.82 m