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The Functional Classification chart shown below has been modified from the national chart to more closely reflect the roads in Pennsylvania.
- 1 Functional Classification reference chart
- 2 Naming
- 3 Locking Standard
- 4 Speed Limits
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.
The PennDOT color coding is cross-referenced in the first column of the table for your convenience.
|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|
|Urban or Rural-Major Collector||n/a|
|Rural Minor Collector||n/a||[b]
| Local Roads or
^b 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 .
State routes with 2 or 3 digit route numbers
In Pennsylvania all State Routes should have any common name as displayed on street signs as the primary name in WME, and the route number in the alternate name field. The city name should be the same for both the common name and route number. SR-111 is the current acceptable format. The use of State Hwy or PA-xxx and other variations should not be used unless it is on the road signs that drivers would see.
State Route naming should follow the following format:
- SR-28 S (divided one-way segments).
- SR-309 (undivided two-way segments).
Note: Some state routes have mixed signage, with route numbers at major intersections and road names at minor intersections. Until Waze gets state shields working completely, the best practice is to name the segments according the the signage that the motorist will see as he approaches the state route, with priority given to the major intersections.
State routes with 4 digit route numbers
State Routes with 4 digits (e.g. SR-3001) should not have the route number in the alternate field. SR-xxxx should be removed from the alt field, if you find it.
County or township roads
County (Co) and Township (T) roads need no special designation or road type. Road number info is not needed in the alternate name field.
When naming a Ramp to a State Route, use the SR-111 format. PA-111 format should not be used unless it matches exactly what is on the big green sign directing you to the ramp. It is best to reference Google Street View in WME, where available.
Adhere to national standards for Exit ramps and Entrance ramps (on-ramps). Ramp names should use these formats:
- Numbered exit: (Exit 16: SR-15 / Scranton)
- Numbered exit with multiple Cities or Routes: (Exit 16: SR-15 N / SR-86 E / Wilkes / Scranton)
- Numbered exit with multiple exits: (Exit 16A-B: SR-15 N / SR-86 E / Scranton)
- Non-numbered exit: (to SR-15 / Scranton)
When naming roads or Ramps, use Penna. as the abbreviation for Pennsylvania. Penn causes text-to-speech conflicts with the numerous items named after William Penn. PA should not be used except as shown below.
Penna. Tpk is the proper abbreviation for naming ramps, and for alternate names for the Turnpike.
Shortened state route names
The format SR-xxx (State Route) should be used when naming ramps (e.g., to SR-28 S / Pittsburgh). See also: Ramps. To maintain uniformity across the state, the PA-xxx format should not be used unless it is on the road signs that drivers would see.
In Pennsylvania we have a set minimum standard for locking roads based on segment type. Any road of a certain segment type must be locked at least to the rank (level) in the chart below. Roads may be locked higher for protection and special situations (areas with construction, tricky design, frequent mistakes, imaging inaccuracies, and the like), but should not be locked lower.
A great time to implement these locks is while bringing the road types of an area into compliance with the current US road type standards (FC and highway systems). Lock the roads based on type after they've been set to current US road type standards.
|Highest rank of connected segments|
Note: Do Not Mass Edit just to update locks to these standards, these can adjusted as you find while editing other aspects of the segments such as FC, speed limits, naming, etc.
Some segments still warrant higher locks and care should be taken when setting segment lock to these standards to look for and protect these special setups with higher locks. Some examples; segments which are part of BDP, U-turn prevention, or using micro-doglegs, or other complex intersection setups.
Speed Limits Near intersections
If a speed limit sign changes the speed limit, and it is 200 feet after the intersection or closer, start the new speed limit AT the intersection.
Speed Limit Sign Location
Look for speed limit signs at the beginning and end of each speed zone, and every 1/2 mile or closer, though some of these signs might be missing in rural areas. 
Roads Without Speed Limit Signs
If there are no posted signs, follow the PA guidelines:
(1) 35 miles per hour in any urban district.
(1.2) 25 miles per hour in a residence district if the highway:
(i) is not a numbered traffic route; and
(ii) is functionally classified by the department as a local highway.
(2) 55 miles per hour in other locations.
PA Speed Limit Resources
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