Sitting in traffic is miserable. It's bad enough when the car congestion is caused by construction or crashes, but it's a far worse feeling to get through a stop and go traffic blockage and find that there was no discernible reason for the slowdown.
Why do these slow spots pop up along the highways? That's what Traffic-Simulation is designed to figure out. These simulations model the effects of changing various traffic conditions to see when and how traffic jams develop. Try adjusting the variables yourself.