1. An equation has been calibrated for the amount of time (in seconds) required to clear N vehicles through a given signal phase (N>5): T= 2.04+2.35N a. What start-up lost time does this equation suggest? b. What saturation headway and saturation flow rate are implied by the equation? 2 The saturation flow rate for an intersection approach is 3600 veh/h. At the beginning of a cycle (effective red) no vehicles are queued. The signal is timed so that when the queue (from the continuously arriving vehicles) is 13 vehicles long, the effective green begins. If the queue dissipates 8 seconds before the end of the cycle and the cycle length is 60 seconds, what is the arrival rate, assuming D/D/1 queuing?

1. An equation has been calibrated for the amount of time (in seconds) required to clear N vehicles through a given signal phase (N>5): T= 2.04+2.35N a. What start-up lost time does this equation suggest? b. What saturation headway and saturation flow rate are implied by the equation? 2 The saturation flow rate for an intersection approach is 3600 veh/h. At the beginning of a cycle (effective red) no vehicles are queued. The signal is timed so that when the queue (from the continuously arriving vehicles) is 13 vehicles long, the effective green begins. If the queue dissipates 8 seconds before the end of the cycle and the cycle length is 60 seconds, what is the arrival rate, assuming D/D/1 queuing?

Structural Analysis

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Concept explainers

Intersection Design

An intersection is a location where two or more roads or railways meet or join. The traffic movement is controlled at the intersection that depends on its design and type. It governs the operation, efficiency, speed, capacity, and safety of the highways, airways, and railways. The movement of the pedestrian causes hazards and delays at the intersection.

Question

1. An equation has been calibrated for the amount of time (in seconds) required
to clear N vehicles through a given signal phase (N>5):
T= 2.04 +2.35N
a. What start-up lost time does this equation suggest?
b. What saturation headway and saturation flow rate are implied by the
equation?
2 The saturation flow rate for an intersection
approach is 3600 veh/h. At the beginning of a cycle
(effective red) no vehicles are queued. The signal is
timed so that when the queue (from the continuously
arriving vehicles) is 13 vehicles long, the effective
green begins. If the queue dissipates 8 seconds before
the end of the cycle and the cycle length is 60 seconds,
what is the arrival rate, assuming D/D/1 queuing?
3
An intersection has a four-phase signal with the
movements allowed in each phase and corresponding
analysis and saturation flow rates shown in The table below
Calculate the sum of the flow ratios for the critical lane
groups.
Phase
Allowed movements
Analysis flow rate
Saturation flow rate
1
EB L, WB L
245, 230 veh/h
1750, 1725 veh/h
2
EB T/R, WB T/R
975, 1030 veh/h
3350, 3400 veh/h
3
SB L, SB T/R
255, 235 veh/h
1725, 1750 veh/h
4
NB L, NB T/R
225, 215 veh/h
1700, 1750 veh/h

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