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(1) What is the flow when avg. speed is 50 mph? (2) A traffic study provided the # of acceptance and rejection by different gap values, shown in the Table below. What is the critical gap? Explain your answer. Hint: you can find that gap value by inspection. No calculation is needed.

(1) What is the flow when avg. speed is 50 mph? (2) A traffic study provided the # of acceptance and rejection by different gap values, shown in the Table below. What is the critical gap? Explain your answer. Hint: you can find that gap value by inspection. No calculation is needed.

Traffic and Highway Engineering
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter6: Fundamental Principles Of Traffic Flow
Section: Chapter Questions
Problem 21P
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Version A. A highway section is determined to have a jam density of 230 veh/mi. A free-flow speed of 65 mph. Answer the following questions: (1) What is the flow when avg. speed is 50 mph? (2) A traffic study provided the # of acceptance and rejection by different gap values, shown in the Table below. What is the critical gap? Explain your answer. Hint: you can find that gap value by inspection. No calculation is needed. Gap (second) 0.5 1 1.2 1.4 1.6 1.8 2 24 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5 # Acceptance 0 2 5 5 6 14 20 25 26 30 40 42 48 50 54 53 60 67 68 70 75 80 # Rejection 80 78 75 75 74 66 60 55 54 50 40 38 32 30 26 27 20 13 12 10 5 0 (3) This highway section crosses a minor road. Drivers from the minor road must seek appropriate gaps to merge onto the highway. Traffic laws require that minor-road traffic merge onto the outside lane of the highway. Traffic flow on that outside lane is found to be 1,200 veh/h. How many cars can turn at most from the minor road per hour? Use the critical gap you obtained from (2). Assume only one car can turn per gap.
Transcribed Image Text:Version A. A highway section is determined to have a jam density of 230 veh/mi. A free-flow speed of 65 mph. Answer the following questions: (1) What is the flow when avg. speed is 50 mph? (2) A traffic study provided the # of acceptance and rejection by different gap values, shown in the Table below. What is the critical gap? Explain your answer. Hint: you can find that gap value by inspection. No calculation is needed. Gap (second) 0.5 1 1.2 1.4 1.6 1.8 2 24 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5 # Acceptance 0 2 5 5 6 14 20 25 26 30 40 42 48 50 54 53 60 67 68 70 75 80 # Rejection 80 78 75 75 74 66 60 55 54 50 40 38 32 30 26 27 20 13 12 10 5 0 (3) This highway section crosses a minor road. Drivers from the minor road must seek appropriate gaps to merge onto the highway. Traffic laws require that minor-road traffic merge onto the outside lane of the highway. Traffic flow on that outside lane is found to be 1,200 veh/h. How many cars can turn at most from the minor road per hour? Use the critical gap you obtained from (2). Assume only one car can turn per gap.
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