67 Pa. Code § 193.2
Words and terms used in this chapter shall have the same meanings as they have in 75 Pa.C.S. (relating to vehicle code), except the following words and terms have the meanings indicated:
Exempt vehicles-The following vehicles are exempt vehicles:
Local authorities-State agencies other than the Department, and county, municipal, and other boards or bodies having authority to enact restrictions relating to traffic; the term includes colleges, universities, public or private schools, and public or historical parks.
Local traffic-Vehicles and combinations going to or coming from a residence, commercial or industrial establishment, or farm located on or within the immediate vicinity of a posted highway or which can only be reached by a posted highway.
Over-posted-size vehicle or combination-A vehicle or combination including its load with a physical dimension-such as length, width, height, turning radius or vehicle underclearance-in excess or in violation of the posted highway size restriction.
Over-posted-weight vehicle or combination-A vehicle or combination having a gross weight in excess of the posted highway weight restriction.
Pilot car-A convoying vehicle provided by the permittee in order to warn the traveling public of an over-posted-weight or over-posted-size vehicle or combination, which may be slow moving or travelling in other than the normal traffic lane.
Posted highway-A highway which has signs erected in accordance with 75 Pa.C.S. § 4902 (relating to restrictions on use of highways and bridges), indicating the maximum weight or size of vehicles or combinations that are permitted on the highway. The term includes bridges on the posted highway unless specifically exempted by the posting authority.
Posting authority-The Department as to State-designated highways, and local authorities as to other posted highways.
67 Pa. Code § 193.2