- Pennways - http://www.pennways.com/
Essays on transportation history in the Philadelphia area.
- City of Pittsburgh Step Trek - http://www.steptrek.org/
Studies in detail streets in Pittsburgh which are really stairways and streets so steep they need stairways as sidewalks.
- Pennsylvania Highways - http://www.pahighways.com/
Includes details and history on state-maintained roadways; special pages on Harrisburg, Philadelphia, Pittsburgh, and Erie; exit guides; and photographs.
- The SWPA Roads Project - http://www.gribblenation.com/swparoads/
Includes histories, photo essays, and discussions.
- Penn-York Roads - http://www.geocities.com/pennyorkroads/
Covers the north-central portion of the state as well as the Southern Tier of New York.
- Meadville Area Highways - http://www.keystonehighways.com/
Covers the city and surrounding area in the west part of the state. Includes history and photographs.
- The Route 15 Coalition - http://204.186.123.53/
Promotes the upgrade of US 15 from the New York state line to the Harrisburg area.
- Old Route 61 - http://www.user.fast.net/~notime/centrali/61pics.htm
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.
- Future Interstate 99 North of I-80 - http://www.lostagain.net/paroadsites/i99.htm
Covers the conditions of existing roadways which are planned to carry an I-99 extension.
- MPG Roads - http://www.gribblenation.net/mpg/
Specific to State College and surroundings. Also covers Georgia and Michigan.
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