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 25 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 140 veh/mi/ln. If it is estimated that the demand flow on the highway during the emergency repairs is 85 percent of the capacity, using the deterministic approach, determine the following. the maximum queue length (in veh) that will be formed the total delay (in h) the number of vehicles that will be affected by the incident the average individual delay (in 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 25 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 140 veh/mi/ln. If it is estimated that the demand flow on the highway during the emergency repairs is 85 percent of the capacity, using the deterministic approach, determine the following. the maximum queue length (in veh) that will be formed the total delay (in h) the number of vehicles that will be affected by the incident the average individual delay (in min)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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 25 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 140 veh/mi/ln. If it is estimated that the demand flow on the highway during the emergency repairs is 85 percent of the capacity, using the deterministic approach, determine the following.
- the maximum queue length (in veh) that will be formed
-
the total delay (in h)
- the number of vehicles that will be affected by the incident
- the average individual delay (in 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 25 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 140 veh/mi/In. If it is estimated that
the demand flow on the highway during the emergency repairs is 85 percent of the capacity, using the deterministic
approach, determine the following.
(a) the maximum queue length (in veh) that will be formed
2200 X
Your response differs from the correct answer by more than 10%. Double check your calculations. veh
(b) the total delay (in h)
4888.889 X
Your response differs from the correct answer by more than 100%. h
(c) the number of vehicles that will be affected by the incident
10200 veh
(d) the average individual delay (in min)
28.758 X
Your response differs from the correct answer by more than 100%. min
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