Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 15, Problem 2P
To determine
(a)
From the given from
To determine
(b)
Lane and usable shoulder lengths.
To determine
(c)
Maximum desirable grade for rolling terrain.
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Chapter 15 Solutions
Traffic and Highway Engineering
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- 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_forwardAn 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 rural collector highway is to be constructed in an area of rolling terrain where the ADT is 950 veh/day. For this situation, determine the following design values: a. Minimum design speed b. Desirable lane width and shoulder width c. Maximum desirable gradearrow_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. c.) Determine the hourly volume for these conditions (Round off to nearestarrow_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 four-lane freeway (2 lanes in each direction) has regular weekday users and currently operates at maximum LOS C conditions. The lanes are 12 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 D in pc/mi/h and vp in pc/hr/ln.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. b.) Determine the adjustment factor (f). (Express in three decimals)arrow_forward6.14 A freeway segment currently has four 11-ft wide lanes and a 3-ft right shoulder in the southbound direction. It is operating in LOS B with a traffic density of 15.6 pc/mi/ln and a peak-hour factor of 0.85. The freeway is on level terrain with 15% heavy vehicles, and currently has no on- or off- ramps within a distance of three miles upstream and downstream of the mid-point of the analysis section. New interchanges are to be constructed that would result in 6 on- and off-ramps within the distance of three miles upstream and downstream of the mid- point of the analysis section and total traffic volume is projected to double, with the same percentage of heavy vehicles, and the peak-hour factor going to 0.95. What would the new LOS and density be after the interchange construction and new traffic conditions?arrow_forwardA 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 estimated free-flow speed of the traffic stream in mph (whole number, nearest 5)? What is the peak-hour factor (3 decimal places)? What is the heavy-vehicle adjustment factor (2 decimal places)? What is the service flow rate (whole number, nearest 5)? What is the service measure value if the average speed of the traffic stream is 65 mph (one decimal place)?arrow_forward
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