United States Routes 1 and 13 used to join for 13 miles through Philadelphia
in Philadelphia County. Today, the routes remain concurrent for the
5 eastern miles of old duplex, and this page covers the western miles
where US 1 or US 13 no longer runs.
Timothy Reichard 5/18/03
Southbound on City Avenue/US 1 in western Philadelphia past Belmont
Road, old signs are still posted from the days of the US 1/US 13 duplex.
US 13 has since been relocated to another southerly route, making
the remaining US 13 sign an error.