Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 10, Problem 6P
To determine
The three components of total control delay of a given lane group.
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TRANSPORTATION ENGINEERING-TRAFFIC SIGNALS"
Recent analysis at an approach to pre-time signalized intersection indicate that the volume-to-capacity ratio (v/c) is 0.8, htat saturation flow rate (s) is 1600 vehicles/hour, and the effective green time is 50 seconds. If the average delay, assuming D/D/1 is 11.25 seconds per vehicle, determine the arrival flow rate (vehicles/hour) and the cycle length.
An intersection of four phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in table pictute below. Calculate the sum of flow ratios for critical lane groups.
An approach to a pretimed signal has 32 seconds of effective green, a saturation flow rate of 1800 veh/h, and a volume-to-capacity ratio less than 1. If the cycle length is 115 seconds and the overall delay formula (Eq. 7.27) estimates an average delay that is 38 seconds greater than that estimated by using just the uniform delay formula, determine the vehicle arrival rate in veh/h. (Assume the signal is isolated and d_3 = 0.
Chapter 10 Solutions
Traffic and Highway Engineering
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- Please 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_forwardQ3c. At a three leg (T) intersection, the two-way peak hour volume on the minor road is 500 veh/hr and that on the major road is 600 veh/hr. As a Traffic Engineer, what type of intersection control will you propose? What is the basis of your proposal?arrow_forwardIn order to determine the DHV from a traffic count worksheet, the first step is to: Group of answer choices Calculate the PHF of each approach Determine which hour has the highest total intersection volume in veh/hr Convert all of the turning counts from veh/15-min to veh/hr Calculate the PHF of the intersectionarrow_forward
- Under what condition is a value of 0.5 assigned to the parameter K in the expression for the lane group delay calculation?arrow_forwardAn 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.arrow_forwardDraw a space – time diagram for traffic within a tunnel. Assuming there exist a 2-lane before the tunnel but the tunnel itself is 1-lane and after the tunnel the road returns to being a 2-lane.arrow_forward
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