Traffic flow on a three-lane (one direction) freeway can be described by the Greenshields model. One lane of the three lanes on a section of this freeway will have to be closed to undertake an emergency bridge repair that is expected to take 2 hours. It is estimated that the capacity at the work zone will be reduced by 35 percent of that of the section just upstream of the work zone. The mean free flow speed of the highway is 60 mi/h and the jam density is 125 veh/mi/In. If it is estimated that the demand flow on the highway during the emergency repairs is 90 percent of the capacity, using the deterministic approach, determine the following. (a) the maximum queue length (in veh) that will be formed Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh (b) the total delay (in h) Your response differs from the correct answer by more than 10%. Double check your calculations. h (c) the number of vehicles that will be affected by the incident Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh (d) the average individual delay (in min) Your response differs from the correct answer by more than 10%. Double check your calculations. min
Traffic flow on a three-lane (one direction) freeway can be described by the Greenshields model. One lane of the three lanes on a section of this freeway will have to be closed to undertake an emergency bridge repair that is expected to take 2 hours. It is estimated that the capacity at the work zone will be reduced by 35 percent of that of the section just upstream of the work zone. The mean free flow speed of the highway is 60 mi/h and the jam density is 125 veh/mi/In. If it is estimated that the demand flow on the highway during the emergency repairs is 90 percent of the capacity, using the deterministic approach, determine the following. (a) the maximum queue length (in veh) that will be formed Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh (b) the total delay (in h) Your response differs from the correct answer by more than 10%. Double check your calculations. h (c) the number of vehicles that will be affected by the incident Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh (d) the average individual delay (in min) Your response differs from the correct answer by more than 10%. Double check your calculations. min
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Traffic flow on a three-lane (one direction) freeway can be described by the Greenshields model. One lane of the three lanes on a section of this freeway will have to be closed to undertake an emergency bridge repair that is expected to take 2 hours. It is estimated that the capacity at the work zone will be reduced by 35 percent of that of the section just upstream of the work zone. The mean free flow speed of the highway is 60 mi/h and the jam density is 125 veh/mi/ln. If it is estimated that the demand flow on the highway during the emergency repairs is 90 percent of the capacity, using the deterministic approach, determine the following.
(a)
the maximum queue length (in veh) that will be formed
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh
(b)
the total delay (in h)
Your response differs from the correct answer by more than 10%. Double check your calculations. h
(c)
the number of vehicles that will be affected by the incident
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh
(d)
the average individual delay (in min)
Your response differs from the correct answer by more than 10%. Double check your calculations. min
Transcribed Image Text:Traffic flow on a three-lane (one direction) freeway can be described by the Greenshields model. One lane of the three lanes on a section of this freeway will have to be closed to undertake an emergency bridge repair that is expected to take 2 hours. It is
estimated that the capacity at the work zone will be reduced by 35 percent of that of the section just upstream of the work zone. The mean free flow speed of the highway is 60 mi/h and the jam density is 125 veh/mi/In. If it is estimated that the demand flow on
the highway during the emergency repairs is 90 percent of the capacity, using the deterministic approach, determine the following.
(a) the maximum queue length (in veh) that will be formed
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh
(b) the total delay (in h)
Your response differs from the correct answer by more than 10%. Double check your calculations. h
(c) the number of vehicles that will be affected by the incident
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh
(d) the average individual delay (in min)
Your response differs from the correct answer by more than 10%. Double check your calculations. min
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