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Highway Engineering - Interview Questions and Answers

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51. For design, that length of transition curve should be taken which is
A. based on allowable rate of change of centrifugal acceleration
B. based on rate of change of super elevation
C. higher of (a) and (b)
D. smaller of (a) and (b)
Explanation:
52. Desire lines are plotted in
A. traffic volume studies
B. speed studies
C. accident studies
D. origin and destination studies
Explanation:
53. If b is the wheel track of a vehicle and h is the height of centre of gravity above road surface, then to avoid overturning and lateral skidding on a horizontal curve, the centrifugal ratio should always be
A. less than b/2h and greater than co-efficient of lateral friction
B. less than b/2h and also less than co-efficient of lateral friction
C. greater than b/2h and less than co-efficient of lateral friction
D. greater than b/2h and also greater than coefficient of lateral friction
Explanation:
54. If an ascending gradient of 1 in 50 meets a descending gradient of 1 in 50, the length of summit curve for a stopping sight distance of 80 m will be
A. zero
B. 64m
C. 80m
D. 60m
Explanation:
55. The transition curve used in the horizontal alignment of highways as per IRC recommendations is
A. spiral
B. lemniscate
C. cubic parabola
D. any of the above
Explanation:
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