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. Timing Stage Allowed movements Analysis flow rate (veh/h) Saturation flow rate(veh/h) Effective green (sec) 1 2 NBL SBL NB T/R 330 365 1125 1700 1750 13.9 SB T/R EB L 1075 110 3400 3300 650 22.1 WB L 80 600 3 EB T/R WB T/R 250 285 1750 1800 11.3

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. Timing Stage Allowed movements Analysis flow rate (veh/h) Saturation flow rate(veh/h) Effective green (sec) 1 2 NBL SBL NB T/R 330 365 1125 1700 1750 13.9 SB T/R EB L 1075 110 3400 3300 650 22.1 WB L 80 600 3 EB T/R WB T/R 250 285 1750 1800 11.3

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter8: Intersection Control

Section: Chapter Questions

Problem 14P

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