Highway Sight Distances - IES Previous Year Questions
11.  What is the minimum stopping sight distance on a -3.5% grade for a design speed of 110 kmph ? (Consider friction coefficient f = 0.28, t = 2.5 sec and G = 0.035)
[IES 2021]
- 76.4 m
- 194.4 m
- 214.6 m
- 270.8 m
Answer: Option D
Explanation:
Design speed, v = 110 kmph = 30.56 m/s
Stopping Sight Distance, SSD = vt +
⇒ SSD = (30.56 x 2.5) +
⇒ SSD = 270.69 m
Explanation:
Design speed, v = 110 kmph = 30.56 m/s
Stopping Sight Distance, SSD = vt +
v2 / 2g(f - 0.01n)
⇒ SSD = (30.56 x 2.5) +
30.562 / 2 x 9.81 x {0.28 - (0.01 x 3.5)}
⇒ SSD = 270.69 m