Question: FD: free - flow speed: 6 0 mph , wave speed: - 1 2 mph , Capacity: 2 4 0 0 vph / lane .

FD: free-flow speed: 60mph, wave speed: -12mph, Capacity: 2400vph/lane. Police car speed: 30mph. Traveled distance: 2mile. Total traffic demand: 4400veh/h. Whats the traffic density behind the policy car? Whats the propagation speed of shock wave? Queue length when the police car leaves? When the queue will dissipate?

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