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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 4P
To determine
The number of lanes required in each direction.
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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):
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
A freeway is to be designed to provide LOS C for the
following conditions: design hourly volume of 5600 veh/h;
PHF: 0.92; trucks: 6%; free flow speed: 70 mi/h; no lateral
obstructions;rolling terrain; total ramp density of 0.75 ramps
per mile.Determine: whether eight (four in each direction)
12 ft lanesare enough to provide LOS C.
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…
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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