Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 10, Problem 8P
To determine
The saturation flow rate for a left turn lane that operates in a permitted only mode under the given condition.
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An existing four-lane freeway in rural area is with the following :information Lane width 3.5m, 0.9m lateral clearance, 1800 veh/hr peak hour volume, PHF=0.9, interchange density =0.90, 5% trucks, 5% buses and the road is within a mountainous terrain. Then based on the HCM procedure, the service flow rate (pc/h/In) is
Andoks highway can accommodate speed of 80 kph under free-flowing conditions. On average, front bumper-to-bumper spacing of 1.58m is occuring on the highway such that the flow stops completely.
Determine the flow of traffic on Andoks Highway if the average speed of the vehicles is 28 kph.
A six-lane freeway (three lanes in each direction) in rolling terrain has 10-ft lanes and obstructions (fLw = 6.0
mph) 4 ft from the right edge of the traveled pavement (fic = 0.8 mph). There are five ramps within three miles
upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. A
directional peak-hour volume of 2000 vehicles (primarily commuters) is observed, with 600 vehicles arriving in
the highest 15-min flow rate period. The traffic stream contains 12% large trucks (ET = 2.5) and buses and 6%
recreational vehicles (ER = 2.0).
1.) What is the estimated free-flow speed of the traffic stream in mph (whole number, nearest 5)?
2.) What is the peak-hour factor
3.) What is the heavy-vehicle adjustment factor?
4.) What is the service flow rate?
5.) What is the service measure value if the average speed of the traffic stream is 65 mph
Chapter 10 Solutions
Traffic and Highway Engineering
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- The equivalent hourly flow rate for an approach with 125 vehicles in the peak 15 minutes and PHF = 0.92 would be:arrow_forwardThe jam density on the approach of the traffic flow on a single lane of Juan Luna St. is 120 veh/km, with a density on the approach of 40 veh/km. If the space-mean speed is 40 kph, determine the free-flow speed in kph.arrow_forwardA Four Lane freeway is located on rolling terrain with a free flow speed of 70 mph,12ft lanes, and no lateral obstructions within 8 ft of the pavement edges. the traffic stream consists of cars, buses and large trucks (no recreational vehicles) . A weekend directional peak hour volume of 1800 vehicles (*regular users*)is observed ,with 700 arriving in the mostly congested 15 minutes period . if a level of service no worse than C is required ,determine the maximum number of large trucks and buses that can be present in the peak hour traffic stream.. Dislike for wrong answersarrow_forward
- During the peak hour, an urban freeway segment has a traffic flow of 6,000 veh/h, with 4,000 vehicles with one occupant and 2,000 vehicles with two occupants. The freeway has five lanes, four of which are unrestricted opening to all vehicles regardless of vehicle occupancy and one lane that is restricted for use by vehicles with two occupants. Link performance functions for the length of this freeway segment are tu = 30+ 0.5vu for the unrestricted lanes and tr = 20+2vr for the restricted lane, where t’s are in minutes and v’s are in 1,000 vehicles. Solve for the distribution of traffic among the lanes using the SO principle and compare the savings in person hours relative to a UE solution, assuming that the compliance is perfect and that no single-occupant vehicles use the restricted lanes.arrow_forwardA six-lane freeway (three lanes in each direction) currently operates at maximum LOS C conditions. The lanes are 11 ft wide, the right-side shoulder is 4 ft wide, and there are two ramps within three miles upstream of the segment midpoint and one ramp within three miles downstream of the segment midpoint. The highway is on rolling terrain with 10% heavy vehicles, and the peak-hour factor is 0.90. Determine the hourly volume for these conditions in veh/h. Round of your answer to whole number. fLW = 1.9, fRLC = 0.80, PHF = 0.90, N = 3 lanes PT = 0.10, ET = 3.0.arrow_forwardA section in SCTEX has a flow density relationship of q = 75k - 2.7k² where q is the flow and k is the density. what is the space mean speed if the density of the expressway is 15 veh/kmarrow_forward
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