Does anyone know the process by which Philadelphia got a lock on the designation “76” for Interstate Highway System routes leading to it?
The Pennsylvania Turnpike is I-76 East from the Ohio border to its Valley Forge Interchange with the Schuylkill Expressway. From there, the *Schuylkill * becomes I-76, still designated an east-west route even though now running directly south its whole length, the last 20 miles to Philadelphia. (The remainder of the PA Turnpike to the New Jersey border becomes I-276.)
In the center of Philadelphia, entering I-676 East, the Vine St. Expressway, from its interchange with I-76, brings you directly to an exit for Independence National Historical Park.
I know (or suspect) this is the reason PA got I-76. But what was the process? Did laws have to be changed? Was there any certain individual spearheading a drive for the I-76 designation?
By the way, I-476 leads to I-76 as well. All 76’s lead to Philadelphia.