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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 9, Problem 5P
To determine
The level of service.
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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:
LOS A
OLOS B
LOS C
LOS D
LOS E
LOS F
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.)
7,090 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/In) for the given conditions.
demand flow rate
2191
pc/h/In
mean speed
density
50 X mi/h
43.82 X pc/mi/In
An urban freeway is to be designed using the following information.
AADT = 51,500 veh/day
K (proportion of AADT occurring during the peak hour): 0.11
D (proportion of peak hour traffic traveling in the peak direction):0.65
Trucks: 8% of peak hour volume
PHF = 0.94
Lane width:12 ft
Shoulder width:10 ft
Total ramp density:0.5 interchange/mile; all interchanges are to be cloverleaf interchanges
Terrain:rolling
Determine the number of lanes in the peak direction required to provide LOS C. (Assume commuter traffic and assume no RVs.)_______
calculations required Calculate your answers for the peak direction only.
Enter fHV,
the peak hour volume _____veh/h
the free flow speed _______ mi/h
the demand flow rate i_______ pc/h/ln
the mean speed ________mi/h
the density ______ pc/mi/ln.)
An existing urban freeway with 4 lanes in each direction has the following characteristics.
Traffic data:
Peak hour volume (in the peak direction):
7,110 veh/h
Trucks:
10% of peak hour volume
PHF = 0.93
Geometric data:
Lane width:
11 ft
Shoulder width:
6 ft
Total ramp density:
1.8 ramps per mile
Terrain:
rolling
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
Show the demand flow rate (in pc/h/ln), mean speed (in mi/h), and density (in pc/mi/ln) for the given conditions.
demand flow rate pc/h/lnmean speed mi/h density pc/mi/ln
Chapter 9 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
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