Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 9, Problem 22P
To determine
The level of service in each direction.
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Question 4
One stretch of two-lane two-way roadway that traverses through level terrain is expected
to carry 1400 vehicle per hour. Determine the Level of Service (LOS) in the peak
direction for the road based on average travel speed (ATS) if the characteristics of the
roadway are as follows:
Table Q4-1
Percentage of Trucks
Percentage of Recreational Vehicle
Peak Hour Factor
10
0.97
60:40
60
Percent Directional Split
Percent no-passing Zone
Lane Widths
Shoulder Widths
Design Speed
Road Length
Access Points
3.35 m
1.2 m
96 km/h
8 km
10 access points per km
State all assumption (if any) used in calculation..
An urban freeway is to be designed using the following information.
AADT = 52,500 veh/day
K (proportion of AADT occurring during the peak hour):
D (proportion of peak hour traffic traveling in the peak direction):
Trucks:
PHF = 0.94
Lane width:
Shoulder width:
Total ramp density:
Terrain:
3
Determine the number of lanes in the peak direction required to provide LOS C. (Assume commuter traffic and assume no RVs.)
lanes.
0.12
0.65
8% of peak hour volume
demand flow rate
12 ft
10 ft
0.5 interchange/mile; all interchanges are to be cloverleaf interchanges
rolling
HV'
Show all calculations required. (Calculate your answers for the peak direction only. Enter fy, the peak hour volume in veh/h, the free flow speed in mi/h, the demand flow rate in pc/h/In, the mean speed in mi/h, and the density in pc/mi/ln.)
fHV
peak hour volume
0.893
free flow speed
mean speed
density
6300
X
Your response differs from the correct answer by more than 10%. Double check your calculations. veh/h
1500
X
Your…
An existing Class I two-lane highway is to be analyzed to determine the level of servicein each direction, given the following information:Traffic data:PHV = 600 veh/h60% in the peak direction8% trucks2% recreational vehiclesPHF = 0.86No passing zones: 40%Geometric data:Rolling terrainBFFS = 55 mi/h (88 km/h)Lane width = 11 ft (3.3 m)Shoulder width = 2 ft (0.6 m)8 access points per mile (5 access points per km)
Chapter 9 Solutions
Traffic and Highway Engineering
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- An existing urban freeway with 4 lanes in each direction has the following characteristics. Traffic data: Peak hour volume (in the peak direction): Trucks: PHF = 0.93 Geometric data: Lane width: Shoulder width: Total ramp density: Terrain: rolling 11 ft 6 ft 1.8 ramps per mile Determine the LOS in the peak hour. (Assume commuter traffic and assume no RVs.) LOS A LOS B LOS C LOS D LOS E LOS F mean speed density 7,010 veh/h 10% of peak hour volume Show the demand flow rate (in pc/h/In), mean speed (in mi/h), and density (in pc/mi/ln) for the given conditions. demand flow rate pc/h/In mi/h pc/mi/Inarrow_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_forwardB- A traffic count was conducted to a rural highway if the peak 15 mints 800 vehicles and peak hourly factor (PHF) 0.95 the directional distribution (35:65)% and traffic composition is 75%p.c and 25%truck, 1-Estimate the number of lanes required ? (capacity = 2000 PC/hr/1 lane) 2- Estimate Level of service if the free flow speed 110 km/hr.arrow_forward
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