This map shows every cycletrack in town. In addition to M Street and 1st Street, there’s L Street, Pennsylvania Avenue, good old reliable 15th Street, and the diminutive R Street lane near the Metropolitan Branch Trail.
For the sake of completeness I also included Rosslyn’s super tiny cycletrack, which exists mainly to access a popular Capital Bikeshare station.
Notice anything missing or wrong?
Cross-posted at BeyondDC.