Question

I need answers with explanation please!!

A-1. An exclusive through lane discharges 10 vehicles in 20 seconds. In the same amount of time a mixed lef-and-through lane discharges 3 left turning vehicles and 4 through vehicles. The left-turn equivalent is: a. b. 2 c. 20 seconds d. 6.66 seconds e. 3.33 seconds A-2. Detectors, in actuated controller operations, measure time between vehicle actuations which is then compared to (circle one of the options below) to extend green time: a. Minimum green time b. Variable minimum green time c. Maximum green time d. Passage time e. Total green time f. Amber +all red time A-3. Three major types of traffic signal controls are: fixed-time control, actuated control, and adaptive control a. True b. False

Answer 1

Through lane discharges 10 vehicles in 20 seconds therefore each vehicle takes 2 seconds in through lane in 20 seconds: in a mixed left and through lane discharge 3 left and 4 through vehicles 4 through vehicles takes 4 times 2 = 8 seconds left turn adjustment factors for } = 0.85 saturation flow rate number of vehicles = 3/0.85 = 3.59 negation 3.6 left turn equivalent = (20-8)/3.6 = 3.33 seconds A2) variable minimum green time A3) False, 3 major types of traffic signal controls are 1) fixed time control 2) Actual control 3) coordinated control