7 links
Bridges and Tunnels of Allegheny County and Pittsburgh, PA
pghbridges.com
A comprehensive listing of the structures. Includes detailed histories and photographs.
City of Pittsburgh Step Trek
steptrek.org
Studies in detail streets in Pittsburgh which are really stairways and streets so steep they need stairways as sidewalks.
Penn-York Roads
geocities.com
Covers the north-central portion of the state as well as the Southern Tier of New York.
Pennsylvania Highways
pahighways.com
Includes details and history on state-maintained roadways; special pages on Harrisburg, Philadelphia, Pittsburgh, and Erie; exit guides; and photographs.
Philadelphia Area Roads, Crossings and Exits
phillyroads.com
History and current information on the highway and bridge system in the metropolitan area.
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