The Adventure Cycling Associationa and ASHTO recently announced the addition of 800+ miles of road and trail to the U.S. Bicycle Route (USBR) system. 3.6 miles of that was added in DC as the DC portion of the C&O Canal Towpath officially became part of USBR 50. The Maryland portion became part of USBR 50 in October of 2013. USBR 50 roughly parallels the American Discovery Trail,starting in DC and passing through Pittsburgh, Dayton, St. Louis, Kansas City, Omaha, Lincoln, Provo, Salt Lake City, Reno and Sacramento before ending in San Francisco, The C&O Canal path is one of the only portions of this route to be fully implemented (along with Ohio's portion) at this time, but Pennsylvania, Nebraska, Nevada, and West Virginia are all working on it.
Here's the current USBR status in the area.
The District of Columbia Metropolitan Washington Council of Governments' Bicycle Committee, with representatives from Virginia and Maryland, are working to extend USBR 1 (alond the East Coast) through DC and Maryland.
Maryland DOT is not currently working on designating USBR 1 and USBR 11; however, MDOT is working with the East Coast Greenway on a signing project for their 166-mile route alignment through Maryland. MDOT plans to submit an application for USBR 11 once the ECG project is complete and issues relating to the preferred alignment for USBR 11 are resolved. The success of USBR 50 combined with completion of signing along the ECG alignment will provide sufficient precedent for working with numerous other jurisdictions to support USBR 1.
Virginia has two U.S. Bicycle Routes 76 and 1, originally designated in 1982. Currently the state DOT is realigning USBR 1 through the northern portion of the state due to changing road conditions and access problems. The DOTs applications for route realignments were approved at AASHTO's fall meeting, with more updates planned for the spring meeting. You can access Virginia's U.S. Bicycle Routes via their free state bike map or view the entire route of USBR 1 and 76 in Virginia in an interactive Google Map. Portions of the routes are currently signed through the state.
In an effort to make broader changes to the U.S. Bicycle Routes running through the state, a team with representatives from the Virginia Bicycling Federation, VDOT, East Coast Greenway,Department of Conservation and Recreation, and Adventure Cycling are working on the major route changes for sections of USBR 76 and USBR 1.