Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 3, Problem 8P
To determine
(a)
Minimum stopping sight distance for a level roadway.
To determine
(b)
Minimum stopping sight distance for a roadway with maximum grade of 7 %
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Calculate the minimum passing sight distance required for a two-lane rural
roadway that has a posted speed limit of 45 mi/h. The local traffic engineer
conducted a speed study of the subject road and found the following:
average speed of the passing vehicle was 47 mi/h with an average
acceleration of 1.43 m/h/sec, and the average speed impeder vehicles was
40 mi/h. Use t1=4.0 and t2=10
The design speed of a multilane highway is 65 mi/h. Determine the following. Note: The term
a
g
in the appropriate equation is typically rounded to 0.35 in calculations. Assume perception reaction time = 2.5 sec.
(a)
the minimum stopping sight distance (in ft) that should be provided for a level roadway
Your response differs from the correct answer by more than 10%. Double check your calculations. ft
(b)
the minimum stopping sight distance (in ft) that should be provided for a roadway with a maximum grade of 3 percent.
Your response differs from the correct answer by more than 10%. Double check your calculations. ft
A driver is traveling at 45 mi/h and has a perception-reaction time of 3 seconds. A deer is spotted at a distance of 380 ft ahead and the driver is able to come to a stop just before hitting the deer. Assuming practical stopping distance, what is the grade of the road in percent?
Chapter 3 Solutions
Traffic and Highway Engineering
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- 4. A car is traveling downhill on a suburban road with a grade of 4% at a speed of 35 mph. Determine the required stopping sight distance.arrow_forward27 …… is the average speed of all vehicles along a roadway as determined by the distance and the rünning times between two selected points. 1. Running speed 2. Posted speed 3. Operating speed 4. Design speedarrow_forwardA section of rural 2 lane highway is to be designed to carry a peak hour volume of 1500 on a level terrain. Determine the level of service at which it will operate using the following data: V Lane width = 11 ft V No passing zone = 20% Directional split = 60/40 V Decimal fraction of trucks = 0.10 V Decimal fraction of recreational vehicles = 0.04 V Decimal fraction of buses = 0.01 Shoulder width =6 ft PHF = 0.95arrow_forward
- Consider the following data: Design speed = 96 kmph Speed of overtaken vehicle = 80 kmph Reaction time for overtaking = 2 sec Acceleration = 2.5 kmph/sec The safe overtaking sight distance on a two-way traffic road way be nearlyarrow_forwardIn anticipation of a long 7° upgrade, a bus driver accelerates at a constant rate of 3 ft/s? while still on a level section of the highway. Knowing that the speed of the bus is 60 mi/h as it begins to climb the grade and that the driver does not change the setting of his throttle or shift gears, determine the distance traveled by the bus up the grade when its speed has decreased to 50 mi/h.arrow_forward5. Calculate the minimum passing sight distance required for a two-lane rural roadway that has a posted speed limit of 45 mi/h. The local traffic engineer conducted a speed study of the subject road and found the following: average speed of the passing vehicle was 47 mi/h with an average acceleration of 1.43 mi/h/sec, and the average speed of impeder vehicles was 40 mi/h.arrow_forward
- What distance will a vehicle travel before coming to a complete stop from a speed of 70 mph, (a) When the vehicle is traveling on a level roadway with no grade, (b-1) When the vehicle is traveling uphill on a roadway of constant grade = 0.10, (b-2) If the roadway grade is not constant but starts at 0.10 uphill and decreases to 0 at a continuous rate, would the braking distance be equal to, greater than, or less than that in the case of a constant 0.10 uphill grade (briefly explain why) (c) When the vehicle is traveling downhill on a roadway of constant grade = 0.10. Assume a perception-reaction time of 2.5 seconds, and an a/g value equal to 0.35.arrow_forward1. The rate flow at a point in the highway is 1200 vehicles/hour. Find the space mean speed in mph if the density of traffic is 25 vehicles per mile 2. Assume you are observing traffic in a single lane of McArthur Highway at a specific location. You measure the average headway and average spacing of the vehicles as 3.2sec. and 50 m. respectively. Determine the traffic speed in kilometer/hourarrow_forwardCalculate the minimum passing sight distance required for a two-lane rural roadway that has a posted speed limit of 45 mi/h. The local traffic engineer conducted a speed study of the subject road and found the following: average speed of the passing vehicle was 47 mi/h with an average acceleration of 1.43 m/h/sec, and the average speed impeder vehicles was 40 mi/h. Write your step by step solutions.arrow_forward
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