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 / according to design speeds. You may interpolate in between values. Answer: 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=+3.40%
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 / according to design speeds. You may interpolate in between values. Answer: 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=+3.40%
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text: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 / according to design speeds. You may interpolate in between values.
Answer: == 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
102 85 68 54 45 36
Running
Speed, kph
Coeff of
Friction /
30 20
0.29 0.30 0.31 0.33 0.35 0.38 0.44 0.44
Source: AASHTO 1984
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