As used in this article, the following terms shall have the meanings indicated:
All vehicular-type equipment, other than trucks, normally used in various construction operations or building maintenance operations. This term shall include but shall not be limited to bulldozers, backhoes, tractors, front-end loaders, trailers designed to carry any construction materials, tools or vehicles and mobile compressor units.
All vehicles designed to be pulled behind a motor-driven vehicle, and shall include but not be limited to boat trailers, boats on trailers and all types of commercial freight trailers.
All commercial or private vehicles ordinarily and commonly referred to as "trucks," specifically including that type of vehicle defined as a "tractor" or "truck tractor" in § 102 of the Vehicle Code of the Commonwealth of Pennsylvania (75 Pa.C.S.A. § 102). "Trucks" classified as panel trucks and pickup trucks, three-quarter-ton or smaller, are excluded from this definition and are not covered by the prohibitions of this article.