33.4.2 - Underwood Exponential Model
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Practice Questions
Test your understanding with targeted questions
What does the variable k represent in the Underwood model?
💡 Hint: Think about how many cars there are in a certain length of road.
Explain how the Underwood model predicts speed as density increases.
💡 Hint: Consider the behavior of vehicles as they become closely packed.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does 'v_f' represent in the Underwood model?
💡 Hint: 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.
💡 Hint: Consider what happens in highly congested scenarios.
1 more question available
Challenge Problems
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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.
💡 Hint: Square away the substitution before calculating the exponent!
Describe how you would use the Underwood model in a real-world scenario for traffic engineering.
💡 Hint: Consider how you would monitor a highway’s traffic conditions.
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