Executive Summary
Traffic congestion and air pollution are urban problems that warrant attention. The wasted time and damage to our health posed by these problems merit efforts to mitigate their impact. For best results, the efforts to mitigate both traffic congestion and air pollution should focus on measures that are cost-effective. That is, we want to achieve the greatest reductions of traffic congestion and air pollution at as little cost as possible. This paper examines a variety of alternative methods for dealing with traffic congestion and air pollution.
