What do you think about building more highways to reduce traffic congestion? If you follow the debate on urban policy, you probably already have the answer on the tip of your tongue: building more lanes doesn't improve traffic! The more highways, the more cars!
Building roads encourages more people to drive. With more paved lanes at their disposal, more people are willing to swap public transit for the convenience of a personal car. Residents might seek housing further away, assuming they can quickly drive to work.
