Question
Transportation Engineering Question on Geometric design of highways
A car is travelling at a speed of 60 km/hr on a section of a National Highway having a downward gradient of 2%. The driver of the car suddenly observes a stopped vehicle on the car path at a distance 130 m ahead, and applies brake. If the brake efficiency is 60%, coefficient of friction is 0.7, driver's reaction time is 2.5 s, and acceleration due to gravity is 9.81 m/s2, the distance (in meters) required by the driver to bring the car to a safe stop lies in the range
A
126 to 130
B
41 to 45
C
33 to 37
D
75 to 79
Answer
75 to 79
Explanation
Solution
The correct option is (D): 75 to 79.