EBK PRINCIPLES OF HIGHWAY ENGINEERING A
6th Edition
ISBN: 9781119299332
Author: WASHBURN
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 7, Problem 10P
To determine
The revised effective green time, yellow time and all red time for each stage.
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A pretimed four-phase signal has critical lane group flow rates for the first three phases of 200, 187, and 210 veh/h (saturation flow rates are 1800 veh/h/ln for all phases). The lost time is known to be 4 seconds for each phase. Assuming Xi = 0.9. If the cycle length is 60 seconds, what is the estimated effective green time of the fourth phase?
An intersection has a three-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below.
(1) Calculate the sum of the flow ratios for the critical lane groups.
(2) calculate the minimum cycle length and the effective green time for each phase (balancing v/c for the critical lane groups). Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired.
Complete solution.
Chapter 7 Solutions
EBK PRINCIPLES OF HIGHWAY ENGINEERING A
Ch. 7 - Prob. 1PCh. 7 - Prob. 2PCh. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Prob. 5PCh. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10P
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- The minimum cycle length for an intersection is determined to be 95 seconds. The cirtical lane group flow ratios were calculated as 0.235, 0.250, 0.170 and 0.125 for phases 1- 4 respectively. What Xc was used in the determination of this cycle length, assuming a lost time of 5 seconds per phase?arrow_forwardTRANSPORTATION ENGINNERING-TRAFFIC SIGNALS An approach to a predetermined signal has 25 seconds of effective green for a 60 second cycle. The approach volume is 500 vehicles/hour and the saturation flow rate is 1400 vehicles/hour. Calculate the average vehicle delay using D/D/1 queing.arrow_forward5-10. The following travel times were measured for vehicles traversing a 1,000-ft segment of an arterial: Vehicle Travel Time (s) 20.6 2. 21.7 1 3 19.8 4 20.3 5 22.5 6 18.5 7 19.0 8 21.4 Determine the time mean speed (TMS) and space mean speed (SMS) for these vehicles.arrow_forward
- Q3- A minor road carrying 100 veh/h on each approach for 8 hours of an average day crosses a major road carrying 260 veh/h on each approach for the same 8 hours, forming a cross intersection. The 85th-percentile approach speed of major roads is 35 kph. In addition, the multiway stop is considered as an interim solution. Determine whether a multiway stop sign is justified at this location if the following conditions exist: 1. The pedestrian volume from the minor street for the same 8 hours traffic volume is 110 ped/h. 2. The average delay to minor-street vehicular traffic during the maximum hours is 40 sec/veh. 3. There is an average of 18 crashes for the last 3-years that may be corrected by installing a multiway stop control.arrow_forwardPlease calculate the level of service and delay for the westbound left lane group, the westbound approach, and the whole intersection. I provided LOS chart for reference.arrow_forwardQUESTION 7 During one hour, 1800 pedestrians passed by the observation point on the pedestrian walkway. The flow appeared to be relatively consistent over the hour (i.e. PHF=0.90). The effective walkway width was 5 ft. Based on the pedestrian flow per unit width (p/ft/min), at what LOS was the walkway operating, assuming there were platoons of pedestrians. O A B E OFarrow_forward
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