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2 cards from this section. Quick, good the night before a test.
What does the logarithmic model express about the relationship between speed and density?
Think about how logarithms work.
Define free flow speed.
What does it mean when there are no delays in traffic?
What does Greenberg’s model predict about speed as density approaches zero?
Think about the extremes of the model.
Is it true that Greenberg's logarithmic model can accurately predict speeds at all densities?
Consider the limitations discussed.
Calculate the speed when the free flow speed is 50 km/h, jam density is 150 vehicles/km, and density is 75 vehicles/km using Greenberg’s model.
Use the logarithm rules to compute.
Discuss the implications of the model predicting infinite speed at zero density. How can this affect traffic planning?
Consider how planners use models for predictions in real contexts.
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