A Trip Within the Beltway - Weblog documenting old and new plans in the area. - http://wwwtripwithinthebeltway.blogspot.com/
DCRoads.net - Guide to the expressway, parkway, bridge and tunnel network in the Washington-Baltimore metropolitan area. Exit listings for area highways. - http://www.dcroads.net/
495sucks.com - Promotes change to improve rush-hour traveling conditions on I-495 and other area highways. - http://www.495sucks.com/
Roads to the Future - Includes in-depth articles about many features. - http://www.roadstothefuture.com/
District of Columbia Highway(s) - Information about the one district-numbered highway (Route 295) and others that could be. - http://www.yurasko.net/wfy/beltway/dc.html