No screeching of brakes or slowing down.
1. Joker was doing or looking at something else and driving was secondary
2. Joker was too drunk to stop
3. Joker was rushing to go somewhere and trying to beat the red light. Thinking he gotared expansive sports car people must give way to him.
4. Joker fell asleep on the wheel so late at nite and car went on auto pilot.