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3. A six-lane urban freeway (3 lanes per direction) is on rolling terrain with 10-ft lanes, obstructions 5 ft from the right edge of the traveled pavement and 8 ramps within 3 miles upstream and 3 miles downstream of the midpoints of the analysis segment. A directional weekday peak-hour volume of 2800 vehicles is observed with 760 vehicles arriving in the most congested 15-min period. The traffic stream has 7% single unit trucks and 3% tractor-trailer trucks. a. Determine the density and the LOS. b. If instead of rolling terrain, the freeway segment has an incline of 4.5% for a distance longer than 2 miles, determine the density and LOS.

3. A six-lane urban freeway (3 lanes per direction) is on rolling terrain with 10-ft lanes, obstructions 5 ft from the right edge of the traveled pavement and 8 ramps within 3 miles upstream and 3 miles downstream of the midpoints of the analysis segment. A directional weekday peak-hour volume of 2800 vehicles is observed with 760 vehicles arriving in the most congested 15-min period. The traffic stream has 7% single unit trucks and 3% tractor-trailer trucks. a. Determine the density and the LOS. b. If instead of rolling terrain, the freeway segment has an incline of 4.5% for a distance longer than 2 miles, determine the density and LOS.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Please answer question 3
2. An intersection has a 2-timing stage signal with the movements allowed in each timing stage, analysis and saturation flow rates shown below. Consider that the lost time per timing stage is 3 seconds and a critical v/c ratio of 0.85 is desired. Calculate minimum cycle length, and the effective green times (based on minimum cycle length). Timing Stage 1 EB L WB L Allowed movements NB T/R SB T/R Analysis flow rate (veh/h) 1125 1075 Saturation flow rate(veh/h) 600 600 3400 3200 650 600 NBL SB L 40 30 100 80 3. A six-lane urban freeway (3 lanes per direction) is on rolling terrain with 10-ft lanes, obstructions 5 ft from the right edge of the traveled pavement and 8 ramps within 3 miles upstream and 3 miles downstream of the midpoints of the analysis segment. A directional weekday peak-hour volume of 2800 vehicles is observed with 760 vehicles arriving in the most congested 15-min period. The traffic stream has 7% single unit trucks and 3% tractor-trailer trucks. a. Determine the density and the LOS. b. If instead of rolling terrain, the freeway segment has an incline of 4.5% for a distance longer than 2 miles, determine the density and LOS. Timing Stage Allowed movements Analysis flow rate (veh/h) Saturation flow rate(veh/h) Effective green (sec) 1 NBL SB L 330 365 1700 1750 13.9 4. An intersection has a 3-timing stage signal with the movements allowed in each timing stage and corresponding analysis and saturation flow rates shown below. Consider that the total lost time is 12 seconds and a critical v/c ratio of 0.85 was desired. The cycle length is 60 seconds. Calculate the delay and level of service for (a) the westbound left lane group, (b) the westbound approach and (c) the whole intersection. NB T/R 1125 3400 2 2 EB T/R WB T/R SB T/R 1075 3300 250 1750 22.1 EB L WB L 110 80 650 600 295 1800 3 EB T/R WB T/R 250 1750 11.3 285 1800
Transcribed Image Text:2. An intersection has a 2-timing stage signal with the movements allowed in each timing stage, analysis and saturation flow rates shown below. Consider that the lost time per timing stage is 3 seconds and a critical v/c ratio of 0.85 is desired. Calculate minimum cycle length, and the effective green times (based on minimum cycle length). Timing Stage 1 EB L WB L Allowed movements NB T/R SB T/R Analysis flow rate (veh/h) 1125 1075 Saturation flow rate(veh/h) 600 600 3400 3200 650 600 NBL SB L 40 30 100 80 3. A six-lane urban freeway (3 lanes per direction) is on rolling terrain with 10-ft lanes, obstructions 5 ft from the right edge of the traveled pavement and 8 ramps within 3 miles upstream and 3 miles downstream of the midpoints of the analysis segment. A directional weekday peak-hour volume of 2800 vehicles is observed with 760 vehicles arriving in the most congested 15-min period. The traffic stream has 7% single unit trucks and 3% tractor-trailer trucks. a. Determine the density and the LOS. b. If instead of rolling terrain, the freeway segment has an incline of 4.5% for a distance longer than 2 miles, determine the density and LOS. Timing Stage Allowed movements Analysis flow rate (veh/h) Saturation flow rate(veh/h) Effective green (sec) 1 NBL SB L 330 365 1700 1750 13.9 4. An intersection has a 3-timing stage signal with the movements allowed in each timing stage and corresponding analysis and saturation flow rates shown below. Consider that the total lost time is 12 seconds and a critical v/c ratio of 0.85 was desired. The cycle length is 60 seconds. Calculate the delay and level of service for (a) the westbound left lane group, (b) the westbound approach and (c) the whole intersection. NB T/R 1125 3400 2 2 EB T/R WB T/R SB T/R 1075 3300 250 1750 22.1 EB L WB L 110 80 650 600 295 1800 3 EB T/R WB T/R 250 1750 11.3 285 1800
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