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MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305581159
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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Question
Chapter 10, Problem 4P
To determine
The adjusted saturation flow rate for a lane group comprised of one lane for the through movement.
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Students have asked these similar questions
A new section of a freeway is to be designed with a free-flow-speed of 65 mph along of
0.75 mile on 5% upgrade. The expected traffic volume is 4200 v/hr. The traffic composition
is 15% trucks, 5% recreational vehicles, and 10% buses. The peak hourly factor is 0.9, the
unfamiliar driver factor is 0.95. If the design requirement is to target a level of service (B),
how many lanes must be provided to satisfy the design requirement?
Determine the saturation flow rate (in veh/h) for a left-turn lane that operates in a permitted-only mode, under the following
conditions.
Opposing demand flow rate = 1,100 veh/h
Lane width 11.5 ft
Heavy vehicles = 4% of the traffic stream
Approach grade -6%
No on-street parking
No bus stops
Bicycle and pedestrian traffic conflicting with this lane group is negligible:
Intersection is not in a central business district
veh/h
3.
Determine the LOS for pedestrians at two-phase signalised intersection with a cycle
length of 90 s. the phase serving the major street vehicular traffic gets 50s of green
whereas the phase serving the minor street vehicular traffic gets 30 s of green.
Useful formula:
dp
Table for assessing the LOS
LOS
A
B
C
D
E
F
0.5(C-g)²
C
Average delay/pedestrian (s)
>5
≥ 5-10
> 10-20
>20-30
≥ 30-45
> 45
Chapter 10 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
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- Problem 2. Consider a freeway section with three lanes in each direction and with a length of 1.25mi (2km) and a +5% grade. In this freeway, the directional peak-hour volume is 3,800 veh/h, from which 76 are trucks and 152 are transit buses. The maximum 15-min volume within the hour of analysis is 1,055 vehicles. The lane widths are 12 ft (3.6m), and shoulder widths are 10 ft (3.1m). There are 2 exit ramps and 1 entrance ramp in the 3 miles in the upstream section and 1 exit ramp and 2 entrance ramp in the 3 miles in the downstream section (consider the same ramp density if using international (km) units). All transit buses will be removed from traffic since the transit service will be replaced by a commuter rail service. However, by removing buses, new additional passage car demand is expected. It is estimated that for each removed bus, 7 new passenger cars will be added to the original traffic volume of 3,800 veh/h. Question: Determine the change in speed and traffic density before…arrow_forwardProblem 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.arrow_forwardA four-lane freeway with the following characteristics: ten foot travel lanes lateral obstructions at 0 feet at the roadside total ramp density is 4.5 ramps/mile rolling terrain The roadway has a current peak demand volume of 3500 veh/h. The peak hour factor is 0.95 and there are no trucks, buses, or RVs in the traffic stream because the roadway is classified as a parkway and such vehicles are prohibited. At what level of service will the freeway operate during its peak period of demand?arrow_forward
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