From the 1911 passage of the
Sproul Road Bill
The Pennsylvania Department of Transportation (PennDOT) is responsible for the establishment and classification of a state highway network which includes Interstate Highways, U.S. Highways, and state routes. U.S. and Interstate highways are cl ...
to the 1987 adoption of the
Location Referencing System
In the U.S. state of Pennsylvania, state highways are generally maintained by the Pennsylvania Department of Transportation (PennDOT). Each is assigned a four-digit State Route (SR) number in the present Location Referencing System. Traffic Routes ...
, all
state highway
A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either Route number, numbered or maintained by a sub-national state or province. A road numbered ...
s in the
U.S. state
In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...
of
Pennsylvania
Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state, state spanning the Mid-Atlantic (United States), Mid-Atlantic, Northeastern United States, Northeastern, Appalachian, and Great Lakes region, Great Lakes regions o ...
were defined as
legislative route
In the United States, a legislative route (LR) or legislative highway is a highway defined by law
Law is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior, with its precise d ...
s, while some were also posted as ''Traffic Routes''. Major routes were assigned three- or four-digit numbers, while minor routes were given five-digit numbers in which the first two digits represented the
county
A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) '' Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denoti ...
, in alphabetical order from 1 (Adams) to 66 (York). (
Philadelphia County
Philadelphia County is the most populous of the 67 counties of Pennsylvania and the 24th-most populous county in the nation. As of the 2020 census, the county had a population of 1,603,797. It is coextensive with Philadelphia, the nation's ...
was initially skipped, but later assigned the number 67.)
State-aid projects, which were carried out even before 1911, received their own permanent numbers - State Aid Application X (SAA X or A-X). Many short routes or realignments were defined as spur or parallel routes to another route.
Often a route remained on its old alignment, while the signed Traffic Route was moved to a newer bypass with a different number.
1-999
1000-9999
See also
*
*
References
Historic County Maps*
{{reflist, 2
Legislative