Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Question
Chapter 9, Problem 4P
To determine
The number of lanes required in each direction.
Expert Solution & Answer
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Students have asked these similar questions
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 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
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
Traffic and Highway Engineering - With Mindtap
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Similar questions
- A 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_forwardA basic segment of a rural freeway has the following characteristics: • Four-lanes (two lanes in each direction)%3B There is one ramp within 3 miles upstream, and 2 ramps within 3 miles downstream; 10-ft lanes; Right shoulder width of 4 ft; • Level terrain;. 10% trucks and 5% buses in the vehicle stream. Calculate the FFS at this freeway section and then determine the level of service (LOS) when the flow rate is 1740 pc/h/In. (Write the answer for the LOS in the box below).arrow_forwardAn 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 LOS 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.) 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/In) for the given conditions. demand flow rate 2199 pc/h/In 54 X mi/h 41 X pc/mi/Inarrow_forward
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