Pennsylvania Highways http://www.pahighways.com/toll/PATurnpike.html#Chapter13

A 13-section history of the Pennsylvania turnpike, from railroad to modern day toll road, this website has many interesting photographs and links to other sites.

The Pennsylvania Turnpike Commission - About the PTC, "Pennsylvania Turnpike ‘Fast Facts"," http://www.paturnpike.com/geninfo/fastfacts/fastfacts.aspx