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Pennsylvania follows the general road naming and road type guidelines of the USA. The Functional Classification chart shown below has been modified from the national chart to more closely reflect the roads in Pennsylvania.
Functional Classification reference chart
Use this chart to determine the road type for Pennsylvania roads based on the functional class.
First, find the functional class of the road from the PennDOT Functional Classification county maps and determine if it is a signed, numbered highway in a one of the highway systems.
Follow the column for the road's highway system down to the row for the road's functional class to find the proper road type for that particular road.
A quick reference guide is shown below the chart.
|Interstate||Interstate Business, Loop, Spur||US Hwy (incl. some special routes)||US Hwy BUS, SPUR, LOOP||State Route Shielded||State Route Unshielded||Locally Maintained|
|Examples||I-80||I-94 Business||US-190||US-460 Business||SR-23 SR-309||SR-2006||Roberts St|
|Other Principal Arterial||n/a|
^a Some 4-digit State Routes are numbered for legacy or maintenance reasons, but they do not serve as primary thoroughfares for the area and should be classified as .
- An Interstate Business Loop classified as a Minor Arterial is a .
- A US Highway classified as a Minor Arterial is a .
- A US Highway Spur route classified as a Minor Arterial is a .
- A State Highway classified as an Other Freeway is a .
- A State Highway classified as a Collector is a .
- A County Route classified as a Minor Arterial is a .
- A County Route classified as a Collector is a
- A locally-maintained road classified as an Other Principal Arterial is a .
- A locally-maintained road classified as a Collector is a .