GATE CE 2016 Set 2 — Question 64
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Transportation Engineering → Cross-Section & Sight Distance → Stopping Sight Distance
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Question
A motorist traveling at on a highway needs to take the next exit, which has a speed limit of . The section of the roadway before the ramp entry has a downgrade of and coefficient of friction (f) is . In order to enter the ramp at the maximum allowable speed limit, the braking distance (expressed in m) from the exit ramp is _________
Correct answer
92 to 93
Solution
The braking distance () for a vehicle decelerating from speed to on a grade is given by:Where:
(downgrade of )Substituting the values:Alternatively, using the formula with speeds in km/h:The braking distance is approximately .
(downgrade of )Substituting the values:Alternatively, using the formula with speeds in km/h:The braking distance is approximately .
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