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The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of the coefficient of friction needed (if no superelevation is provided) will, respectively, be
  • a)
    1/11.6 and 0.10
  • b)
    1/10.5 and 0.37
  • c)
    1/11.6 and 0.24
  • d)
    1/12.9 and 0.24
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The radius of a horizontal circular curve on a highway is 120 m. The d...
Given ⇒ R = 120 m

f = 0.15

If full lateral friction is assumed to develop, then

If, e = 0

= 0.24
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Most Upvoted Answer
The radius of a horizontal circular curve on a highway is 120 m. The d...
Given data:
Radius of horizontal circular curve, R = 120 m
Design speed, V = 60 km/hour
Coefficient of lateral friction, f = 0.15

To find:
Superelevation required (e) and coefficient of friction needed (μ)

Formula used:
(e) = (V^2) / (127R)
(μ) = f / (1 - (e/g))

Calculation:
Given, design speed V = 60 km/hour
Converting km/hour to m/s, V = (60 x 1000) / 3600 = 16.67 m/s
Radius of horizontal circular curve R = 120 m
Coefficient of lateral friction f = 0.15

Substituting the values in the formula (e) = (V^2) / (127R)
(e) = (16.67^2) / (127 x 120)
(e) = 1/11.6

Substituting the values in the formula (μ) = f / (1 - (e/g))
Assuming g = 9.81 m/s^2
(μ) = 0.15 / (1 - (1/11.6 x 9.81 / 16.67^2))
(μ) = 0.24

Therefore, the superelevation required (e) is 1/11.6 and the coefficient of friction needed (μ) is 0.24. Hence, the correct answer is option C.
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The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of the coefficient of friction needed (if no superelevation is provided) will, respectively, bea)1/11.6 and 0.10b)1/10.5 and 0.37c)1/11.6 and 0.24d)1/12.9 and 0.24Correct answer is option 'C'. Can you explain this answer?
Question Description
The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of the coefficient of friction needed (if no superelevation is provided) will, respectively, bea)1/11.6 and 0.10b)1/10.5 and 0.37c)1/11.6 and 0.24d)1/12.9 and 0.24Correct answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of the coefficient of friction needed (if no superelevation is provided) will, respectively, bea)1/11.6 and 0.10b)1/10.5 and 0.37c)1/11.6 and 0.24d)1/12.9 and 0.24Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of the coefficient of friction needed (if no superelevation is provided) will, respectively, bea)1/11.6 and 0.10b)1/10.5 and 0.37c)1/11.6 and 0.24d)1/12.9 and 0.24Correct answer is option 'C'. Can you explain this answer?.
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