Traffic congestion is a worsening problem in many U.S. cities. A persistent and significant source of that congestion is freeway bottlenecks—specific chokepoints on major highways that routinely experience traffic backups. A 1999 study by the American
Highway Users Alliance entitled Unclogging America’s Arteries: Prescriptions for Healthier Highways identified the 166 worst bottlenecks in the country and evaluated the benefits of removing them. Check out the report.