A Trip Within the Beltway
- Weblog documenting old and new plans in the Washington area.
- http://wwwtripwithinthebeltway.blogspot.com/

Capital Beltway Corridor Transportation Study
- Includes maps of the study.
- http://capitalbeltway.mdprojects.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/

Delmarva Highways
- Contains information and photographs covering the area on this peninsula.
- http://www.delmarvahighways.com/

Central PA/MD Roads
- Includes route logs and photographs.
- http://www.m-plex.com/roads/

Roads to the Future
- Includes in-depth articles about many features.
- http://www.roadstothefuture.com/

Maryland Roads
- Route log.
- http://www.mdroads.com