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2 cards from this section. Quick, good the night before a test.
What is effective green time?
Consider how green, yellow, and lost times play a role.
Define lost time in the context of traffic signals.
Think about delays when the light changes.
What is effective green time?
Focus on how lost time influences total movement capacity.
True or False: Lost time is only the time for the yellow light.
Consider what happens when a signal changes.
A traffic signal allows for 35 seconds of green, 6 seconds of yellow, with 4 seconds of lost time. What is the effective green time, and how many vehicles can pass through if the saturation flow rate is 1000 vehicles/hour?
Use the formula for each part of the calculation.
For a cycle length of 120 seconds and an effective green time of 45 seconds, with the lost times totaling 6 seconds, what is the saturation flow rate if the lane capacity is found to be 900 vehicles/hour?
Rearranging the capacity equation helps to find saturation flow.
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