Several lanes and sidewalks will be closed on K Street, N.W., from 21st Street, N.W. to 12th Street, N.W., on Tuesday and Wednesday from 9:30 a.m. to 3:30 p.m.
The District Department of Transportation will be updating the area to meet American with Disabilities Act requirements.
The temporary closures will affect traffic in both directions, DDOT said.
The department "encourages all commuters to stay alert as they travel in this corridor."