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 14P
To determine
The traffic characteristics of each of the six levels of service for two lane highways.
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Briefly describe the traffic characteristics associated with each of the levels of service for basic freeway sections.
QUESTION 1
a) Briefly explain the following:
i) Level of service of a highway link
ii) Design hour volume
iii) Peak hour factor
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.
Chapter 9 Solutions
Traffic And Highway Engineering
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- A multi-lane Minor Arterial is being designed through a level urban area. The current daily volume = 8000 vpd in both directions with 10% Trucks, peak hourly factor 90%and a 60% directional distribution factor. How many lanes are required?arrow_forwardTraffic volume is 2578 veh/hr with 687 vehicles arriving in peak 15 minutes.There are tow lanes, 12 percent trucks(30/70 split for SUT/TT), the length of the road is 1.8 miles long with a 3.5 percent grade. calculate the analysis flow rate?arrow_forwardwhich type of urban road would have free-flow traffic characteristics? 1. Arterial 2. Local 3. Freeway 4. Collectorarrow_forward
- A 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 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)arrow_forwardThe highway is classified into two categories in terms of the service provided by the roadway and roadway systems. This are the Accessibility and Mobility. And Define and describe each classificationDescribe and Identify all types of traffic signalsarrow_forward
- An 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_forwardYou are designing a freeway as a passenger-car-only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75,000 vehicles per day, a peak-hour factor of 0.88, and a directional distribution of 0.65. day. It is estimated that the freeway will have a free flow speed of 70mi/h. Determine the number of lanes (both directions) required to provide at least LOS D using the 60th highest annual hourly volume. Use k =0.11.arrow_forwardA six-lane freeway (three lanes in each direction in mountainous terrain has 10-ft lanes and obstructions 1ft 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 commuter 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
- Question - 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: 112 km/h; no lateral obstructions; rolling terrain; total ramp density of 0.5 ramps /km. Determine: Number of 3.6 m lanes required in each direction. Please give the correct answerarrow_forwardThe following diagram illustrates the number of conflicting points at a 4-approach unsignalized intersection with one lane for each approach. The conflicting points are classified as points for merging, diverging, and crossing. How many conflict points will there be if the intersection geometry is changed to two off-set “T” intersections? Scratch your solution and label all conflicting points by classification.arrow_forwardramps within 3 miles upstream and downstream of the segment midpoint. It is on rolling terrain with 10% heavy vehicles and is operating at capacity with a peak-hour factor of 0.9. If the road is expanded to four 11-foot lanes with a 2-foot right shoulder, and traffic after the expansion is projected to increase by 10% with the same heavy vehicle percentage and peak-hour factor, what is the new LOS and estimated density? P-22 Chapter 6 Problems hour. What would be the LOS before and after the heavy vehicles are allowed on the upgrade (assuming 50% SUTs and 50% TTs.)? 6.21 A multilane highway has four lanes (two lanes in each direction) and a measured FFS of 55 mi/h. The directional peak-hour volume is 1900 vehicles (the peak-hour factor is 0.80). One upgrade is 5% and is 0.62 mi long. Currently, heavy vehicles are not permitted on the highway, but local authorities are considering allowing heavy vehicles on this upgrade. If this is done, they estimate that 150 heavy vehicles will use…arrow_forward
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