Pennsylvania Department of Transportation:Lists driver and vehicle services, traveller and construction information, and details on public safety.
Pennsylvania Highways:Includes details and history on state-maintained roadways; special pages on Harrisburg, Philadelphia, Pittsburgh, and Erie; exit guides; and photographs.
Central PA/MD Roads: Includes route logs and photographs.
City of Pittsburgh Step Trek: Studies in detail streets in Pittsburgh which are really stairways and streets so steep they need stairways as sidewalks.
Fayette Expressway Completion Organization: Citizens' group site on new toll roads in the southwest part of the state. Includes maps.
Future Interstate 99 North of I-80: Covers the conditions of existing roadways which are planned to carry an I-99 extension.
Meadville Area Highways: Covers the city and surrounding area in the west part of the state. Includes history and photographs.
MPG Roads: Specific to State College and surroundings. Also covers Georgia and Michigan.
Old Route 61: Photos and description of the former routing of State Route 61 through Centralia, which was rerouted when an underground coal mine fire caused the road to break up.
Penn-York Roads: Covers the north-central portion of the state as well as the Southern Tier of New York.
Pennsylvania and Pittsburgh Roads: Historic maps and information about the roads in the Pittsburgh area.
Pennways: Essays on transportation history in the Philadelphia area.
Philadelphia Area Roads, Crossings and Exits: History and current information on the highway and bridge system in the metropolitan area.
The Route 15 Coalition: Promotes the upgrade of US 15 from the New York state line to the Harrisburg area.
The SWPA Roads Project: Includes histories, photo essays, and discussions.