Underpass at M Street
It’s most similar structure in
It carries two lanes in each direction for South Capitol Street traffic, descending and ascending between N and L Streets, with a 3rd lane per direction proceeding through an at grade surface traffic light intersection with east-west surface M Street.
To its south,
The two above illustrations are from the web site of the National Association to Restore Pride in the Nation's Capital:http://www.narpac.org/REXLRPRO.HTM