Practice Lane Capacity (41.5.2) - Trafic Signal Design - I - Transportation Engineering

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6 sample questions

Question 1.
What is lane capacity?
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Think about how vehicles are counted.
Question 2.
Define effective green time.
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Consider what happens when the signal changes.
3Question 3.
What is the formula to calculate lane capacity?
- c = g / C
- c = G - L
- c = s * t
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Think about how to find capacity.
4Question 4.
True or False: Effective green time includes lost time.
- True
- False
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Consider what effective means.
Question 5.
A city intersection has a saturation flow rate of 1750 vehicles/hour. During peak hours, the cycle time is 70 seconds with an effective green time of 40 seconds. Calculate the lane capacity and discuss its implications on intersection design.
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Follow the capacity formula to derive your answer.
Question 6.
In a new traffic signal design, loss time during signal change is projected to be 5 seconds. How would you account for this in your lane capacity calculation if the green time remains unchanged?
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Always consider how lost time affects total available time for vehicles.

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