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What is the mechanical widening required for a pavement of width 7 m on a horizontal curve of radius 490 m, if the longest wheel base of vehicle expected on the road is 7.0 m?
  • a)
    0.07 m
  • b)
    0.05 m
  • c)
    0.49 m
  • d)
    0.1 m
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
What is the mechanical widening required for a pavement of width 7 m o...
Mechanical widening (Wm) on road is given by:
As width of pavement = 7.0 m, this implies number of lanes are 2.
So, n = 2
l = length of wheel base = 7.0 m (given)
R = radius of the curve = 490 m
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Most Upvoted Answer
What is the mechanical widening required for a pavement of width 7 m o...
Solution:

The mechanical widening required for a pavement on a horizontal curve is given by the formula:

W = (V^2 / gR) + B

Where,
V = design speed (km/h)
g = acceleration due to gravity (9.81 m/s^2)
R = radius of curve (m)
B = wheel base of the vehicle (m)

Given, width of pavement (W) = 7 m
Radius of curve (R) = 490 m
Longest wheel base of vehicle (B) = 7.0 m

Assuming a design speed of 60 km/h (16.67 m/s), the mechanical widening required is:

W = (16.67^2 / 9.81 * 490) + 7.0
W = 0.1 m (approximately)

Therefore, the correct answer is option D, 0.1 m.
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