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Capital Beltway Corridor Transportation Study
http://www.rkkengineers.com/sha/capital/
Includes maps of the study.
Central PA/MD Roads
http://www.m-plex.com/roads/
Includes route logs and photographs.
Delmarva Highways
http://www.delmarvahighways.com/
Contains information and photographs covering the area on this peninsula.
Erin's HOV Flyover tribute page
http://www.grinnell.edu/individuals/nichols/flyover.html
Information about the HOV ramp on I-270 north of Washington, DC.
Maryland Department of Transportation
http://www.mdot.state.md.us/
Traveler information and reports.
Maryland Roads
http://www.mdroads.com
Route log.
Roads to the Future
http://www.roadstothefuture.com/
Includes in-depth articles about many features.
Takoma Park Highway Design Studio
http://www.highwaysandcommunities.com/
Discusses highways' impact on communities, concentrating on the Washington, DC area.