Pennsylvania Route 309 in the context of Mountaintop, Pennsylvania

Broad Street is a major arterial street in Philadelphia, Pennsylvania. The street runs for approximately 13 miles (21 km), beginning at the intersection of Cheltenham Avenue on the border of Cheltenham Township and the West/East Oak Lane neighborhoods of North Philadelphia to the Philadelphia Navy Yard in South Philadelphia. It is Pennsylvania Route 611 along its entire length with the exception of its northernmost part between Old York Road and Pennsylvania Route 309 (Cheltenham Avenue) and the southernmost part south of Interstate 95.

Broad Street runs along a north–south axis between 13th Street and 15th Street, containing what would otherwise be known as 14th Street in the Philadelphia grid plan. It is interrupted by Philadelphia City Hall, which stands where Broad and Market Street would intersect in the center of the city. The streets of Penn Square, Juniper Street, John F. Kennedy Boulevard, and 15th Street form a circle around City Hall at this point.