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Traffic on a three-lane freeway observes a triangular flow-density relationship with free-flow speed vf=100km/h, capacity c=2000veh/h/lane, jam density...

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Civil Engineering

Traffic on a three-lane freeway observes a triangularflow-density relationship with free-flow speedvf=100km/h, capacity c=2000veh/h/lane,jam density kj=150veh/km/lane. Flow in thefreeway from upstream is 5000veh/h, while the ramp flow isnegligible (almost zero).At 9:45am, an accident occurs at point A.The vehicles involved close one lane of traffic (total capacityreduces to 4000veh/h) for 15min and afterwards the scene is clear(capacity returns to 6000veh/h). Lucy enters the freeway via theramp at point B at 10:00am. Distance AB is equal to 6.5km.What time[h] does Lucy leave the queue?What time [h] does Lucy pass theaccident scene (point A)?

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