The Mechanical Widening of the Curve is Given by

Answer: A. W_m=nl²/2R

The mechanical widening of the curve is given by W_m=nl²/2R.

Solution

Extrawidening is the extra width of road provided on the horizontal curve

Extrawidening is provided to-

• Avoid the offtracking of the vehicle 
• To account lateral skidding
• To confront the psychological tendency of the driver
• To increase the visibility at curves

Types of Extra Widening-

1. Mechanical Widening: The Mechanical Widening of the Curve is given by W_m=nl²/2R
2. Psycological Widening: W_P=V/9.5 √R

Total Extra Widening 

W_e=W_m + W_P

W_e=nl²/2R + V/9.5 √R

Where,    

W_e - Total Extra Widening

W_m- Mechanical Extra Widening

W_P - Psychological Extra Widening

n - Number of lanes

l - Length of wheel base

R - Radius of the curve

V - Speed in Kmph

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