The average speed of vehicles on a road with a downgrade of 4% is 90 kph. A traffic study was conducted to improve the braking distance (reduce the braking distance) due to a high risk of accident occurrence on this road during the night. a. If the existing braking distance is 120 m, determine what would be the recommended speed limit based on a reduction in braking distance of 20%. Use Table 1 for values of coefficient of friction f according to design speeds. You may interpolate in between values. Answer: v = 80.10 kph b. If the grade is to be reduced to achieve this reduction in braking distance, what would the new grade of the road be? Answer: G = +3.48% Table 1. Running Speed vs. Coefficient of Friction Running Speed, kph Coeff of Friction f 102 85 68 54 45 36 30 20 0.29 0.30 0.31 0.33 0.35 0.38 0.44 0.44 Source: AASHTO 1984
The average speed of vehicles on a road with a downgrade of 4% is 90 kph. A traffic study was conducted to improve the braking distance (reduce the braking distance) due to a high risk of accident occurrence on this road during the night. a. If the existing braking distance is 120 m, determine what would be the recommended speed limit based on a reduction in braking distance of 20%. Use Table 1 for values of coefficient of friction f according to design speeds. You may interpolate in between values. Answer: v = 80.10 kph b. If the grade is to be reduced to achieve this reduction in braking distance, what would the new grade of the road be? Answer: G = +3.48% Table 1. Running Speed vs. Coefficient of Friction Running Speed, kph Coeff of Friction f 102 85 68 54 45 36 30 20 0.29 0.30 0.31 0.33 0.35 0.38 0.44 0.44 Source: AASHTO 1984
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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