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A district road with a bituminous pavement has a horizontal curve of 1000 m for a design speed of 75 km ph. The super-elevation is

  • a) 1 in 40
  • b) 1 in 50
  • c) 1 in 60
  • d) 1 in 70
Correct answer is option `A`. Can you explain this answer?
Verified Answer
A district road with a bituminous pavement has a horizontal curve of 1...
A District road having the mixed traffic condition so speed is reduced by 25%.

Super elevation e = V^2 / 225 R.
e = 75 * 75/225 * 1000 
= 0.025.

so for 1m,
1/0.025 = 40.
=> 1 in 40.
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Most Upvoted Answer
A district road with a bituminous pavement has a horizontal curve of 1...
Given:
Horizontal Curve = 1000 m
Design Speed = 75 kmph

To find:
Super-elevation

Formula:
Super-elevation (e) = (v^2)/(127R+f)
Where,
v = design speed in kmph
R = radius of the horizontal curve in meters
f = coefficient of friction (taken as 0.15 for bituminous pavement)

Calculation:
Radius of the curve (R) = (Design Speed)^2 / (127*(Curve Length in meters)) = (75)^2 / (127*(1000)) = 4.23 m

Using the formula for super-elevation:
e = (75^2)/(127*4.23 + 0.15) = 0.028 or 1 in 40 (approx)

Therefore, the correct option is (a) 1 in 40.
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A district road with a bituminous pavement has a horizontal curve of 1000 m for a design speed of 75 km ph. The super-elevation isa) 1 in 40b) 1 in 50c) 1 in 60d) 1 in 70Correct answer is option `A`. Can you explain this answer?
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