[Editor's note: This map is an example of direct annotation of a schematic flow diagram with real world map coordinates. Better than a list, better than interactive roll overs. All in a static graphic!]
Republished from The Washington Post.
Despite an overall decrease in traffic congestion, there are still spots where traffic regularly comes to a crawl during peak periods. Here are the 10 worst traffic choke points in the region. These areas are characterized by severe congestion and extended delays – car speed ranged from 10 to 20 miles per hour, with 115 to 100 cars per mile, per lane.