"Construction equipment" shall mean all bulldozers, rollers, scrapers, graders, spreaders, pavers, bituminous mixers, retreading machines, compressors, power shovels, excavators, backhoes, wagons, concrete mixers, generators, message boards, wood chippers, bucket loaders, snow loaders, rooters, scarifiers and construction tractors, and such other items of equipment which in the opinion of the director should be classified as construction equipment. Construction equipment that must be transported or moved over the highways that is overwidth or overweight shall comply with special permits as required by RSA 228:21 and RSA 265:7. Road oilers, bituminous distributors and heavy duty platform trailers and semi-trailers are expressly excepted from this definition.