Bureau of Maintenance and Operations (January 2015). Roadway Management System Straight Line Diagrams (Report) (2015 ed.). Pennsylvania Department of Transportation. Retrieved January 30, 2016.
Pennsylvania Department of Transportation (2015). Pennsylvania Traffic Volume Map(PDF) (Map). Pennsylvania Department of Transportation. Archived from the original(PDF) on October 25, 2017. Retrieved January 3, 2018.
Pennsylvania Department of Transportation (2015). Pennsylvania Traffic Volume Map(PDF) (Map). Pennsylvania Department of Transportation. Archived from the original(PDF) on October 25, 2017. Retrieved January 3, 2018.