Source:1-way-loop
From Pittsburgh Streets
"1-way loop to surround N. S. center: All right turns to speed traffic effective today." Pittsburgh Post-Gazette, Dec. 4, 1967, p. 26. Newspapers.com 88155232.
"1-way loop to surround N. S. center: All right turns to speed traffic effective today." Pittsburgh Post-Gazette, Dec. 4, 1967, p. 26. Newspapers.com 88155232.