Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 9, Problem 5P
To determine
The level of service.
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An urban freeway is to be designed using the following information.
AADT = 51,900 veh/day
K (proportion of AADT occurring during the peak hour): 0.12
D (proportion of peak hour traffic traveling in the peak direction): 0.65
Trucks: 8% of peak hour volume
PHF = 0.96
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…
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): 0.12
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.)_______ lanes
Show all calculations required. (Calculate your answers for the peak direction only. Enter fHV, the peak hour volume in veh/h, the free flow speed in mi/h, the demand flow rate in pc/h/ln, the mean speed in mi/h, and the density in pc/mi/ln.)
fHV ________
peak hour volume___________veh/h
free flow speed_______ mi/h
demand flow rate___________ pc/h/ln
mean speed_________ mi/h
density_____________ pc/mi/ln.
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.)
Chapter 9 Solutions
Traffic and Highway Engineering
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- An 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 two-lane rural highway carries a peak hour volume of 465 (vph) and has the following characteristics: Roadway: 60mph design; 11 foot lanes, 2 foot shoulders; rolling terrain; 60% no-passing zones; length = 3 miles. Traffic: 70/30 directional split; 4% trucks; 2 percent recreational vehicles; 1 percent buses; PHF = 0.95 a) What Level of Service will the highway operate under during peak periods? b) What is the capacity of the highway? Explain why this is less than 2,800 (vph)?arrow_forwardA four-lane basic freeway segment on level terrain is being redesigned. The current roadway has 12 ft lanes with 4 ft shoulders. The proposed alignment would expand to six 11-ft lanes with 2 ft shoulders. The road carries 3000 vehicles in the peak hour in one direction, with 925 coming in the peak 15 minutes. The truck mix is 70/30 and makes up 10% of traffic. What is the density and LOS (level of service) before and after the proposed change?arrow_forward
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