I think the problem is more complex than more cars. If you have more cars but road size stays the same, after a point traffic is slower moving. I imagine the gr

I think the problem is more complex than more cars. If you have more cars but road size stays the same, after a point traffic is slower moving. I imagine the graph to be like a bell curve. But if you widen roads and make other improvements to accommodate traffic then the graph would be more linear.