I'm not sure how that can be a problem. If traffic couldn’t have any effect on your city, then why bother simulating it? The whole point is to make you think ah

I'm not sure how that can be a problem. If traffic couldn’t have any effect on your city, then why bother simulating it? The whole point is to make you think ahead and plan the capacity of your road network so that traffic jams are less likely and fixing them is easier.