The fundamental law of road congestion: New roads will create new drivers, resulting in the intensity of traffic staying the same.
Expanding highways and roads increases congestion by creating more demand. And building out public transportation systems doesn't help either; there will always be more drivers to fill up any new road we build."
"The disheartening study used data from hundreds of metro areas in the U.S. to reach the conclusion that there is a "fundamental law of highway congestion," which essentially says that people drive more when there are more roads to drive on—no matter how much traffic there is. As a result, increased building of "interstate highways and major urban roads is unlikely to relieve congestion of these roads."