Consider a section of four-lane freeway (two lanes in each direction) ash shown below. The freeway typically carries 255
Posted: Thu Feb 17, 2022 11:06 am
Consider a section of four-lane freeway (two lanes in each
direction) ash shown below. The freeway typically carries 2550
veh/hr during the morning peak period. An accident occurs at 8:15
at point B, blocking the entire freeway in that direction. After
the accident is cleared and traffic begins to flow again past point
B.
The fundamental diagram for the freeway traffic flow is given
above. Using shockwave analysis, answer the following:
1. Where is the end of the queue at 8:30 AM?
2. By what time would the accident have to be cleared so to not
disrupt the flow of traffic entering the freeway at the entrance
ramp at point A?
7 miles A B
Freeway Flow - Density Relationship 4000 3500 3000 =300 veh/mi (2550, 42.85) 2500 Flow (vehicles/hour) 2000 S, = 60 mph 1500 1000 500 (0, 300) 0 0 20 40 60 80 100 120 200 220 240 260 280 300 320 140 160 180 Density (vel/milane)
direction) ash shown below. The freeway typically carries 2550
veh/hr during the morning peak period. An accident occurs at 8:15
at point B, blocking the entire freeway in that direction. After
the accident is cleared and traffic begins to flow again past point
B.
- Consider A Section Of Four Lane Freeway Two Lanes In Each Direction Ash Shown Below The Freeway Typically Carries 255 1 (17.39 KiB) Viewed 54 times
- Consider A Section Of Four Lane Freeway Two Lanes In Each Direction Ash Shown Below The Freeway Typically Carries 255 2 (28.81 KiB) Viewed 54 times
above. Using shockwave analysis, answer the following:
1. Where is the end of the queue at 8:30 AM?
2. By what time would the accident have to be cleared so to not
disrupt the flow of traffic entering the freeway at the entrance
ramp at point A?
7 miles A B
Freeway Flow - Density Relationship 4000 3500 3000 =300 veh/mi (2550, 42.85) 2500 Flow (vehicles/hour) 2000 S, = 60 mph 1500 1000 500 (0, 300) 0 0 20 40 60 80 100 120 200 220 240 260 280 300 320 140 160 180 Density (vel/milane)