The idea is to prevent traffic jams by keeping a flow of cars going, but to be honest it does absolutely nothing to stop them. There's a roundabout down the road from my house which is an absolute nightmare on weekday mornings. :mad5:
There are only about two left in New Jersey and they are absolute nightmares. People merging on to a small circle from 8 different directions is not a smart way of stopping traffic, let me tell ya.