Consider a section of four-lane freeway (two lanes in each direction) ash shown below. The freeway typically carries 255

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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.

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 52 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 52 times

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)