D.C. Mun. Regs. tit. 18, r. 18-2301
Whenever traffic is controlled by traffic control signals exhibiting the words "GO," "CAUTION," or "STOP," or exhibiting different colored lights successively one at a time, or with arrows, the terms and lights shall apply to pedestrians as set forth in this section.
Pedestrians facing a GREEN SIGNAL or the word "GO," my proceed across the roadway within any marked or unmarked crosswalk, except where special pedestrian control signals show a "DON'T WALK" signal.
Pedestrians facing a STEADY YELLOW SIGNAL are thereby advised that there is insufficient time to cross the roadway, and any pedestrian then starting to cross shall yield the right-of-way to all vehicles.
Pedestrians facing a STEADY RED SIGNAL or the word "STOP" shall not enter the roadway, except where special pedestrian control signals show a "WALK" signal.
Pedestrians facing a vertical GREEN or "THRU" ARROW may proceed across the roadway in any marked or unmarked crosswalk.
D.C. Mun. Regs. tit. 18, r. 18-2301