Traffic emerges from the tunnel on Rock Creek Parkway as seen from the Duke Ellington Bridge on Calvert Street above the park. If you click the thumbnail at right you can see a map of this area. This picture was taken from Calvert street above Rock Creek, which is in the center of the map, about where the “w” is in “Rock Creek and Potomac Parkway.” The tunnel noted on the map is the tunnel from which these cars are emerging.