Transportation Engineering Roll No. - 69 do the numerical part 2. Explain with the help of sketches various types of highway intersections. The 15 minute design traffic volume on cross road 1 and 2 during peak hour are observed as 180+R.No. and 150+R.No. vehicles per lane respectively. If the amber times required are 4 and 3 seconds respectively for two roads, design the signal timing by trial cycle (or exact) method. Assume average time headway of 2.5 sec during green phase. СОЗ

Transportation Engineering Roll No. - 69 do the numerical part 2. Explain with the help of sketches various types of highway intersections. The 15 minute design traffic volume on cross road 1 and 2 during peak hour are observed as 180+R.No. and 150+R.No. vehicles per lane respectively. If the amber times required are 4 and 3 seconds respectively for two roads, design the signal timing by trial cycle (or exact) method. Assume average time headway of 2.5 sec during green phase. СОЗ

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter8: Intersection Control

Section: Chapter Questions

Problem 8P

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A volume of 320 veh/h. Assume that the vehicle arrivals are Poisson distributed. What is the probability that the headway between successive vehicles will be less than 10 seconds. choices: 62.70%, 58.90%, 56.30%, 60.00%
Observers stationed at two sections XX and YY, 1000 ft apart on a highway, record the arrival times of four vehicles as shown in the table below. Vehicle Section XX Section YY A T0 T0 + 14.33 sec B T0 + 3.76 sec T0 + 18.14 sec C T0 + 7.94 sec T0 + 22.06 sec D T0 + 12.13 sec T0 + 27.87 sec If the total time of observation at XX was 20 sec, determine (a) the time mean speed, (b) the space mean speed, (c) the flow at section XX, and (d) the density on the highway
Studies have shown that the traffic flow on a two-lane road adjacent to aschool can be described by the Greenshields model. A length of 0.5 miadjacent to a school is described as a school zone and operates for a periodof 30 min just before the start of school and just after the close of school.The posted speed limit for the school zone during its operation is 15 mi/h.Data collected at the site when the school zone is not in operation showthat the jam density and mean free speed for each lane are 125 veh/mi and57 mi/h. If the demand flow on the highway at the times of operation ofthe school zone is 90% of the capacity of the highway, determine: The speeds of the shock waves created by the operation of the schoolzone, and• The number of vehicles affected by the school zone in the upsream ofthe zone during this 30-minute operation.
Choose the right answer traffic volume data has been collected for 15 min time intervals as shownbelow. Find the total hourly volume, flow rate and peak hour factor (PHF). Time:7:30 - 7:45 7:45 - 8:00 8:00 - 8:15 8:15 - 8:30 Volume 200 300 350 250 * a-0.876 b-0.877 c-0.878
19 Compute the peak hour factor if the hourly volume of traffic is 1964 veh/hour and the highest 15-min volume is 722. Round off to two decimal places.
Assume you are an observer standing at a point along a three-lane roadway. All vehicles in lane 1 are traveling at 30 mi/h, all vehicles in lane 2 are traveling at 45 mi/h, and all vehicles in lane 3 are traveling at 60 mi/h. There is also a constant spacing of 0.5 milebetween vehicles. If you collect spot speed data for all vehicles as they cross your observation point, for 30 minutes, what will be the time-mean speed and space meanspeed for this traffic stream?
An intersection has a three-phase signal with the movement allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired Phase 1 2 3 Allowed Movement NB L, SB L NB T/R, SB T/R EB L, WB L EB /T/R, WB T/R Analysis Flow Rate 330, 365 veh/h 1125, 1075 veh/h 110, 80 veh/h 250, 285 veh/h Saturation Flow Rate 1700, 1750 veh/h 3400, 300 veh/h 650, 600 veh/h 1750, 1800 veh/h Calculate the Following: 1.)Sum of flow ratios for critical lane groups 2.)minimum cycle length 3.)using v/c equation ratio, calculate the effective green time for phase 1 4.)using v/c equation ratio, calculate the effective green time for phase 2 5.)using v/c equation ratio, calculate the effective green time for phase 3
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A) A traffic engineer records the travel times of vehicles as they traveled a 1.0-mile segment of highway during (1.2, 1.25, 1.6, 1.5, 1.8, and 1.5 minutes). Find space mean speed (SMS) and time mean speed (TMS).