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Question 1:
By trying different values of p while keeping other parameters unchanged, we find that for small density traffic (for example, p=0.1, p=0.2), the traffic is in free-flowing phase. The graph after 20000 steps look like the picture showed in Plot1. Plot 1 Plot 2 (p=0.1, size=100*100, 2,0000 steps) (p=0.6, size=100*100, 20000 steps)       

For large density, such like p=0.6,p=0.7,p=0.8, the traffic is in a jammed phase as what Plot ...

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