Where the Riders Are

Greater Greater Washington, a DC-based transit and livable cities blog, as an awesome set of maps showing the ridership levels at every segment of the DC Metro system.

Apparently WMATA doesn't collect this kind of ridership data, so author Matt Johnson and a friend of his collected the info themselves.

BART does collect this data, and is great about releasing it to the public for analysis and interpretation. Hopefully one of the Bay Area's skilled transit geek cartographers can bust out a local version of GGW's diagram.