Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 7, Problem 12P
To determine
Width of the turning roadway if the design vehicle is a single-unit truck.
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A six-lane freeway (three lanes in each direction) in rolling terrain has 10-ft lanes and obstructions (fLW = 6.0 mph) 4 ft from the right edge of
the traveled pavement (fLC = 0.8 mph). There are five ramps within three miles upstream of the segment midpoint and four ramps within three
miles downstream of the segment midpoint. A directional peak-hour volume of 2000 vehicles (primarily commuters) is observed, with 600
vehicles arriving in the highest 15-min flow rate period. The traffic stream contains 12% large trucks (ET = 2.5) and buses and 6% recreational
vehicles (ER = 2.0).
What is the heavy-vehicle adjustment factor (2 decimal places)?
A six-lane freeway (three lanes in each direction) in rolling terrain has 10-ft lanes and obstructions (fLw = 6.0
mph) 4 ft from the right edge of the traveled pavement (fic = 0.8 mph). There are five ramps within three miles
upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. A
directional peak-hour volume of 2000 vehicles (primarily commuters) is observed, with 600 vehicles arriving in
the highest 15-min flow rate period. The traffic stream contains 12% large trucks (ET = 2.5) and buses and 6%
recreational vehicles (ER = 2.0).
1.) What is the estimated free-flow speed of the traffic stream in mph (whole number, nearest 5)?
2.) What is the peak-hour factor
3.) What is the heavy-vehicle adjustment factor?
4.) What is the service flow rate?
5.) What is the service measure value if the average speed of the traffic stream is 65 mph
A freeway is being designed to carry a heavy volume of 5000 veh/h on a regular weekday in rolling terrain. If the PHF is 0.9 and the traffic consists of 90% passenger cars and 10% trucks, determine the number of 12-ft lanes required in each direction if the highway is to operate at level of service C. The free-flow speed is 70 mi/h, there is no lateral obstruction, and interchanges are 3 mi apart.
Chapter 7 Solutions
Traffic and Highway Engineering
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- traffic engineering - Q / A freeway is being designed to carry a heavy volume of 5000 veh / h on a regular weekday in rolling terrain . If the PHF is 0.9 and the traffic consists of 90 % passenger cars and 10 % trucks , determine the number of 12 - ft lanes required in each direction if the highway is to operate at level of service C. The free - flow speed is 70 mi / h , there is no lateral obstruction , and interchanges are 3 mi apart .arrow_forwardA divided multilane highway in a recreational area has four lanes (two lanes in each direction) and is on rolling terrain. The highway has 10-ft lanes with a 6-ft right-side shoulder and a 3-ft left-side shoulder. The posted speed is 50 mi/h. Previously, there were 4 access points per mile, but recent development has increased the number of access points to 12 per mile. Before development, the peak-hour factor was 0.95, and the directional hourly volume was 2200 vehicles with 13% heavy vehicles. After development, the directional hourly volume is 2600 vehicles with the same vehicle percentages and peak-hour factor. What is the LOS before and after the development?arrow_forwardQu. A two-lane minor road with a +5% approach grade intersects with a four-lane undivided road. Determine the minimum intersection sight distance on the major road required for a stopped single-unit truck to depart from the minor road (in the upgrade direction) and turn right onto the major road. The design speed is 30 km/h on the minor road and 50 km/h on the major road.arrow_forward
- Q2/ A 3200 ft segment of 3.25-mi four-lane undivided multilane highway in a suburban area is at a 1.5% grade. The highway is in level terrain, and lane widths are 11 ft. The measured free-flow speed is 46.0 mi/h. The peak-hour volume is 1900 veh/h, PHF is 0.90, and there are 13% trucks and 2% RVs. Determine the LO, speed, and density.arrow_forwardA six-lane multilane highway (three lanes in each direction) has 10-ft lanes with 5-ft shoulders on the right side. There are 10 access points per mile and the posted speed limit is 50 mph. The median is TWLTL. Estimate the free flow speed.arrow_forwardA 6-mile two lane highway in rolling terrain has the following data: Volume = 1500 veh/hr (two way); PT = 14%; PRV = 4%; peak fifteen minute volume is 415 vehicles. Percent no passing is 60% for a 50-50 directional split; lane width is 10.5ft, with a shoulder width of 4-ft; access points = 20 per mile. Assume the base free flow speed measured on the field is 65 mph. Determine the free flow speed at the highway section in mph.arrow_forward
- A four-lane freeway with 12 ft lanes and 5 shoulders is on a 2% grade for the 1.25-mi analysis stretch. There are 2 ramps in this section. If the traffic mix is generally 6% heavy vehicles with a 70/30 SUT/TT split and a PHF of 0.8, how many vehicles can the freeway carry in the peak hour without dropping below Level of Surface (LOS) C?arrow_forwardA 2-lane highway has lane widths of 9ft (2.75 m), with 6ft (1.83 m) clear hard shoulders. There are no-passing zones along 40% of its length. The directional split is 70/30 in favour of the peak direction. The percentages for the various heavy vehicle types are: P, - 10% P- 4% P- 2% The terrain is rolling. Calculate the service flow of the highway when running at full capacity.arrow_forwardA six-lane freeway (three lanes in each direction) has regular weekday users and currently operates at maximum LOS C conditions. The lanes are 11 ft wide, the right-side shoulder is 4 ft wide, and there are two ramps within three miles upstream of the segment midpoint and one ramp within three miles downstream of the segment midpoint. The highway is on rolling terrain with 10% large trucks and buses (no recreational vehicles), and the peak-hour factor is 0.90. b.) Determine the adjustment factor (f). (Express in three decimals)arrow_forward
- A six-lane freeway (three lanes in each direction) has regular weekday users and currently operates at maximum LOS C conditions. The lanes are 11 ft wide, the right-side shoulder is 4 ft wide, and there are two ramps within three miles upstream of the segment midpoint and one ramp within three miles downstream of the segment midpoint. The highway is on rolling terrain with 10% large trucks and buses (no recreational vehicles), and the peak-hour factor is 0.90. a.) Determine the Free Flow Speedarrow_forwardA six-lane freeway (three lanes in each direction) has regular weekday users and currently operates at maximum LOS C conditions. The lanes are 11 ft wide, the right-side shoulder is 4 ft wide, and there are two ramps within three miles upstream of the segment midpoint and one ramp within three miles downstream of the segment midpoint. The highway is on rolling terrain with 10% large trucks and buses (no recreational vehicles), and the peak-hour factor is 0.90. Determine the hourly volume for these conditions.arrow_forwardA two-lane minor road intersects a two-lane undivided major road at 90 degrees, forming a four-leg intersection with traffic on the minor road controlled by a yield sign. A building is located 50 m from the center line of the outside lane of the major road and 14 m from the center line of the nearest lane of the minor road. A passenger car on the minor road would like to cross the major road. Using the AASHTO procedure, determine the maximum speed that can be allowed on the minor road if the design speed on the major road is 80 km/h. Assume a 3% approach grade for the minor road. Note: 1km/hr = 0.62mi/h, 1ft = 0.3048marrow_forward
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