6. Design signal timing for an intersection with the following details. Assume a total loss time of 3 seconds per phase. Width of lanes are 12 ft each. Assume that there are 20 pedestrians crossing each of the approaches per cycle. Check the signals for pedestrian crossing time. Take pedestrian walking speed as 4 ft/s. Saturation flow rates are: Left-turning: 1600 veh/hr/ln, Through: 1800 veh/hr/In, and Right-turning: 1700 veh/hr/In 115 79 Jul J AN 338 Phase I Phase II 11 1 JII

6. Design signal timing for an intersection with the following details. Assume a total loss time of 3 seconds per phase. Width of lanes are 12 ft each. Assume that there are 20 pedestrians crossing each of the approaches per cycle. Check the signals for pedestrian crossing time. Take pedestrian walking speed as 4 ft/s. Saturation flow rates are: Left-turning: 1600 veh/hr/ln, Through: 1800 veh/hr/In, and Right-turning: 1700 veh/hr/In 115 79 Jul J AN 338 Phase I Phase II 11 1 JII

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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Question

6. Design signal timing for an intersection with the following details. Assume a total loss time
of 3 seconds per phase. Width of lanes are 12 ft each. Assume that there are 20 pedestrians
crossing each of the approaches per cycle. Check the signals for pedestrian crossing time.
Take pedestrian walking speed as 4 ft/s.
Saturation flow rates are: Left-turning: 1600 veh/hr/ln, Through: 1800 veh/hr/In, and
Right-turning: 1700 veh/hr/In
488
488
234-
115
C
1051
217
N
338
-338
Phase I
Phase II
Phase III
11
AN
J||
N

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Step 2: Calculate Saturation flow rate

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Step 3: Pedestrian crossing time

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Step 4: Calculation of green time:

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Step 5: Check the signals for pedestrian crossing time

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Problem 1: Textbook Problem 7.1 W An intersection approach has one left-turn lane. The signal cycle length is C = 90 seconds, which is divided into r= 74 seconds of effective red, followed by g = 16 seconds of effective green. At t = 0 (start of the effective red), there is a queue of 3 vehicles. Left turn vehicles arrive at a constant rate of λ = 200 . During the 16 second effective green time, left-turn vehicles cross the stop line at one vehicle every 2 seconds. veh a. Sketch the graph of cumulative arrivals and departures from t = 0-90 seconds. Shade the area that represents the total delay. b. At t = 90 seconds, how many vehicles arrived? How many vehicles departed?
An approach at a signalized intersection with a 60-second cycle gets 30 seconds of displayed green time. Yellow time is 4 seconds and all-red is 2 seconds (lost time is to be determined from standard assumptions). At the beginning of an effective red there are 4 vehicles in the queue and the saturation flow is 876 veh/h. The arrival rate is given by v(t) = 0.20 - 0.002t [with v(t) in veh/s and t in seconds after the beginning of the effective red]. What is the average vehicle delay for this approach in seconds at the end of the cycle (until the next effective red) that started with the 4 vehicles queued at the beginning of the effective red? (Assume D/D/1 queueing. Please provide you answer in decimal form without units)
7.12 The saturation flow rate of an approach to a pretimed signal is 6000 veh/h. The signal has a 60-second cycle with 20 seconds of effective red allocated to the approach. At the beginning of an effective red (with no vehicles remaining in the queue from a previous cycle), vehicles start arriving at a rate v(t) = 0.4 +0.01t + 0.00057+² (where v(t)) is in vehicles per second and t is the number of seconds from the beginning of the cycle). 30 seconds into the cycle the arrival rate remains constant at its 30-second level and stays at that rate until the end of the cycle. What is the total vehicle delay over the cycle (in vehicle- seconds), assuming D/D/1 queuing?
Design a two phase traffic signal by using webster's method when the average normal flow of traffic on cross roads 1 and 2 during design period are 400 and 250 P.C.U/hr respectively. Also the saturations flow values are estimated as 1250 and 1000 P.C.U/hr and the all-red time required for crossing of pedestrian is 12 seconds.
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