The following words and terms, when used in this chapter, shall have the following meanings, unless the context clearly indicates otherwise:
Department-The Department of Transportation of the Commonwealth of Pennsylvania.
Limited access highway-A highway in respect to which owners or occupants of abutting lands and other persons have no legal right of access except at points and in the manner determined by the authority having jurisdiction over the highway.
Mud and snow tire-A tire which, when, compared with conventional rib-type passenger car tires, has a relatively aggressive tread pattern and is designed primarily to provide additional starting, stopping, and driving traction in mud and snow. The tread shall also have ribs, lugs, blocks, or buttons, be generally discontinuous, and have the following characteristics when inflated:
Snow emergency route-A limited access highway which the Department has designated as a snow emergency route by the posting of traffic control devices as provided for in § 213.4 (relating to posting).
67 Pa. Code § 213.2