An interesting point to mention is that the traffic "jam" moves backwards. This is because at the front of the jam, cars are able to accelerate out of it, while at the back o the jam cars are piling up into it. Seen from above the jam is a shock wave moving backwards.
This often upsets people when they get out of a jam only to see there was nothing causing it! In reality what caused it may have been much further up the road.
This often upsets people when they get out of a jam only to see there was nothing causing it! In reality what caused it may have been much further up the road.