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3 cards from this section. Quick, good the night before a test.
What does the variable k represent in the Underwood model?
Think about how many cars there are in a certain length of road.
Explain how the Underwood model predicts speed as density increases.
Consider the behavior of vehicles as they become closely packed.
What does 'v_f' represent in the Underwood model?
Think about the top speed vehicles can achieve without constraints.
True or False: The Underwood model predicts that speed reaches zero when density is zero.
Consider what happens in highly congested scenarios.
If the free flow speed is 80 km/h and k0 is 250 veh/km, calculate the speed when density is 125 veh/km. Explain your steps.
Square away the substitution before calculating the exponent!
Describe how you would use the Underwood model in a real-world scenario for traffic engineering.
Consider how you would monitor a highway’s traffic conditions.
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