Creating intersections To achieve better flow through the city it is much better to use T-Junctions than four way intersections.This is simply because there will be fewer vehicles trying to cross the path of oncoming traffic for which they have to wait until it passed. You may have noticed that often queues will form where traffic is waiting to turn left across the path of traffic. Intersections that are too close together are another thing to avoid. This is because the flow of traffic during the green phase of one of the intersections towards the next intersection will be very small due to the area available for the vehicles to wait and most of the green phase will have been wasted as no cars are moving.