See this 09-20-2014 message from a resident on the 2000 block of 1st Street NW, eastside:
Due to the street closures re 1st Tunnel Project, many drivers are transiting the alleys on the east side of 1st Street NW between U and Bryant Streets NW in both directions, often forcing the alley to accommodate simultaneous two way traffic -- As one Park user described it on Saturday, "this alley has become the new 1st Street."
Unfortunately, this massive increase in traffic, some of it exceeding 30 miles per hour, poses a very dangerous situation for residents along the north-south 1st street alleys and, particularly, adults and children using Crispus Attucks Park.
So, I implore you to please SLOW DOWN to 10-15 mph, if you must transit the 1st Street NW alleys instead of using a dedicated street.
Concerned Resident of First Street NW