PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Question
Chapter 6, Problem 17P
To determine
The level of service of the highway.
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Problem 2:
A Class III two-lane highway is on level terrain, has a measured free-flow speed of 45 mi/h, and
has 100% no-passing zones. During the peak hour, the analysis direction flow rate is 150 veh/h,
the opposing direction flow rate is 100 vehh, and the PHF = 0.95. There are 5% large trucks and
10% recreational vehicles. Determine the level of service.
Problem
Determine the level of service? for six lanes undivided level highway. The
width of lane, shoulder on the right side, and shoulder on the left side are 10 ft,
2 ft, and 2 ft respectively. The directional hour volume is 3500 Veh/h. The traffic
composition includes 15% trucks and 1% RVs. The peak hour factor is 0.80.
Unfamiliar drivers use the road that has 10 access points per mile. The design
speed is 55 mi/h.
Discuss possible modifications to upgrade the level of service? (Verify your
answer)
Eight lane urban freeway is on level terrain with lane width of 12 ft, right shoulder lateral
clearance of 4 ft, and 12 ramps over the 6-mi analysis segment. The traffic stream consists of
unfamiliar road users. Peak hour volume for a directional weekday of 3200 vehicles is observed
with 900 vehicles arriving in the most congested 15-min period. If the traffic stream has 20%
large trucks and 20% buses and 15% recreational vehicles, determine the density in pc/mi/In.
Round your answer to 3 decimal places. Exclude the unit in the answer box.
Chapter 6 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Prob. 27PCh. 6 - Prob. 28PCh. 6 - Prob. 29PCh. 6 - Prob. 30PCh. 6 - Prob. 31PCh. 6 - Prob. 32PCh. 6 - Prob. 33PCh. 6 - Prob. 34PCh. 6 - Prob. 35PCh. 6 - Prob. 36PCh. 6 - Prob. 37P
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- A multilane highway (three lanes in each direction) is on level terrain. The free flow speed has been measured at 50mph. The peak-hour directional volume is 1500 vehicles with 10% heavy vehicles, and PHF is 0.9. If the proportion of vehicles types and peak-hour factor remains constant, how many vehicles can be added to the directional volume before capacity is reached?arrow_forwardA eight-lane multilane highway (four lanes in each direction) currently operates at maximum LOS C conditions. The measured FFS is 50 mi/h. The highway is on rolling terrain with 11% SUTS and 11% TTs, and the peak-hour factor is 0.92. If 13.4% of all directional traffic occurs during the peak hour, determine the total directional traffic volume.arrow_forwardAn existing six-lane divided multilane highway with a field-measure free-flow speed of 45mph serves a peak-hour volume of 4,000 vehicles per hour, with 10% trucks (50% SUT, 50% TT). The PHF is 0.88. The highway has generally rolling terrain. What is the likely level of service for this segment? Good weather, no incidents, no work zones, and regular drivers may be assumed.arrow_forward
- Eight lane urban freeway is on mountainous terrain with lane width of 12 ft, right shoulder lateral clearance of 4 ft, and 12 ramps over the 6-mi analysis segment. The traffic stream consists of familiar road users. Peak hour volume for a directional weekday of 5200 vehicles is observed with 500 vehicles arriving in the most congested 15-min period. If the traffic stream has 10% large trucks and 12% buses and 10% recreational vehicles, determine the density in pc/mi/In. Round your answer to 3 decimal places. Exclude the unit in the answer box.arrow_forwardAnswer fastarrow_forward(TRAFFIC AND HIGHWAY ENGINEERING) An undivided multilane highway segment has two 11-ft lanes in the eastbound direction with no shoulders and a 55 mi/h speed limit. This highway segment has 40 access points on a 1.25-mile, 2.5% upgrade. During the highest 15 minutes of traffic flow within the peak hour, there are 755 vehicles and 12% of these are heavy vehicles with a 70%/30% mix of single-unit and tractor-trailer trucks. What are the estimated speed, density, and LOS of upgrade?arrow_forward
- An eight-lane freeway (four lanes in each direction) is on rolling terrain and has 11-ft lanes with a 4- ft right-side shoulder. The total ramp density is 1.5 ramps per mile. The directional peak-hour traffic volume is 5400 vehicles with 11% heavy vehicles. The peak 15-minute volume is 1421 vehicles. What are the freeway’s density and level of servicearrow_forwardTransportation engineeringarrow_forwardThere are 9 vehicles observed in a 300 m section of McArthur highway. If the average time headway is 4 sec., compute the space mean speed of the vehicles in kph.arrow_forward
- Given a data on a two-way, two-lane highway 9km long on a rolling terrain are as follows: Volume = 1500 veh/hr (two way); PT = 14%; PRV = 4%; peak 10 minute volume = 315 vehicles. Percent no passing is 50% for a 50-50 directional split. Determine the LEVEL of service using available data on both class I and II.arrow_forwardAn 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) isarrow_forwardA freeway is being designed to carry a heavy volume of 5000 veh/h on a regular weekday in rolling terrain. If the PHF is 0.9 and the traffic consists of 90% passenger cars and 10% trucks, determine the number of 12-ft lanes required in each direction if the highway is to operate at level of service C. The free-flow speed is 70 mi/h, there is no lateral obstruction, and interchanges are 3 mi apart.arrow_forward
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