Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
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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- A six-lane freeway (three lanes in each direction) in mountainous terrain has 10-ft lanes and obstructions 1 ft from the right edge. There are five ramps within three miles upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. The traffic stream consists of mostly commuters with a peak hour factor of 0.84, peak-hour volume of 2500 vehicles, and 4% recreational vehicles. What is the level of service? (Write the letter only)arrow_forward4) Determine the level of service (LOS) for a freeway segment with the following data. Show all steps involved. Demand volume (3452 vehicle per hour) ● ● ● ● ● ● ● 1 Number of lanes (3 lanes in one direction) Width of lanes (11ft per lane) Lateral clearance on the right side of the freeway (4 ft) Total ramp density (2 miles between ramps, or 0.5 ramps per mile) Percent of heavy vehicles (5% trucks/buses and 0% recreational vehicles) Peak hour factor (0.927) I Terrain (level) Driver population factor (familiar drivers)arrow_forwardsolve for D, E, AND F sub questions as per bartleby guidelines.arrow_forward
- A 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 new section of a freeway is to be designed with a free-flow-speed of 65 mph along of 0.75 mile on 5% upgrade. The expected traffic volume is 4200 v/hr. The traffic composition is 15% trucks, 5% recreational vehicles, and 10% buses. The peak hourly factor is 0.9, the unfamiliar driver factor is 0.95. If the design requirement is to target a level of service (B), how many lanes must be provided to satisfy the design requirement?arrow_forwardAn existing Class I two-lane highway is to be analyzed to determine the two-way level of service, given the following information: Traffic data: PHV _ 600 veh/h 60% in the peak direction 8% trucks 2% recreational vehicles PHF = 0.86 No-passing zones: 40% Geometric data: Rolling terrain BFFS _ 55 mi/h Lane width _ 11 ft Shoulder width _ 2 ft 8 access points per milearrow_forward
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- B- 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_forwardAn undivided multilane highway segment has the following characteristics: • Six lanes (three lanes in each direction); Lane width of 11 ft; • Speed limit of 45 mph; Right shoulders is 4 ft wide; • There are approximately 25 access points over a 2-mile section of this roadway, in each direction. Calculate the FFS at this highway section and then determine the level of service (LOS) when the flow rate is 1100 pc/h/In. (Write the answer for the LOS in the box below).arrow_forwardA six-lane freeway (three lanes in each direction) in mountainous terrain has 10-ft lanes and obstructions 5 ft from the right edge. There are zero ramps within three miles upstream of the segment midpoint and one ramp within three miles downstream of the segment midpoint. The traffic stream consists of mostly commuters with a peak hour factor of 0.84, peak-hour volume of 2500 vehicles, and 4% recreational vehicles. What is the level of service?arrow_forward
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