For any practical purposes road traffic can be considered a gaseous element that quickly fills as much space as is allocated for road space, with heavy emphasis

For any practical purposes road traffic can be considered a gaseous element that quickly fills as much space as is allocated for road space, with heavy emphasis on segments that lead to several destinations. Conversely, when roads are put on a diet and lanes are removed it generally turns out that the traffic does not pack into queues twices as long, as is often expected or feared, but generally disappears. To control congestion is to control the space available where congestion can happen. Build a two lane road and you will have two lanes of congestion. Build an eight lane road and you will have eight lanes of congestion.