Maryland Department of Transportation:Traveler information and reports.
Capital Beltway Corridor Transportation Study: Includes maps of the study.
Central PA/MD Roads: Includes route logs and photographs.
DCRoads.net: Guide to the expressway, parkway, bridge and tunnel network in the Washington-Baltimore metropolitan area. Exit listings for area highways.
Delmarva Highways: Contains information and photographs covering the area on this peninsula.
Maryland Roads: Route log.
Roads to the Future: Includes in-depth articles about many features.