(Silver Lake Dr.) in Pittsburgh, Allegheny County, PA. Braddock Av. N. 1.4 miles from jct with I376 exit 7, W. (left) on PA8 (Penn Av.) 1.0 miles, N. (right) on PA8 (Washington Blvd) 0.3 miles to the tunnel. (N40 27.732 W79 54.292) Photos by Don Johnson 11-8-10.