Chief Engineer refers to the Chief Engineer of the Department or an employee or employees of the Department designated by the Chief Engineer to carry out one or more of the responsibilities assigned to the Chief Engineer in accordance with 700 CMR 8.00.

Department or MassDOT shall mean the Massachusetts Department of Transportation, a body politic and corporate established pursuant to M.G.L. c. 6C.

Gross Vehicle Weight Rating.

1. (a) The gross vehicle weight rating established by a manufacturer, or where the manufacturer is unwilling or unable to so establish the rating, by the Registrar of Motor Vehicles, when applied to a motor vehicle, trailer, semi-trailer or semi-trailer unit including the gross combination weight rating, if any, when applied to a semi-trailer unit or to a tractor- trailer combination;
2. (b) For the purposes of 700 CMR 8.15 through 8.18, the words "gross vehicle weight rating," as used in 700 CMR 8.15 through 8.18, shall mean the gross combination weight rating which means a value established by a manufacturer as the loaded weight of a combination vehicle.

Irreducible Load. Any object or load including the transporting vehicle whose gross weight or dimensions when loaded has been reduced to a practical minimum as determined by the Chief Engineer.

Motor Vehicle.

1. (a) Any vehicle defined as a motor vehicle under M.G.L. c. 90, § 1;
2. (b) For the purposes of 700 CMR 8.15 through 8.18, the words "motor vehicle(s)," as used in 700 CMR 8.15 through 8.18 shall mean only a three-axle truck type vehicle as shown in 700 CMR 8.14: Attachment C: Diagram of Motor Vehicle and Trailer.

Reducible Load. Any load or object including the vehicle whose gross weight or dimensions can be practically reduced to a lesser gross weight or dimension as determined by the Chief Engineer.

Semi Trailer. Refers to the term "semi-trailer" as defined in M.G.L. c. 90, § 1 and includes a trailer so designed and used in combination with a tractor that some part of the weight of such trailer and that of its load rests upon, and is carried by, the tractor.

Semi Trailer Unit. Refers to the term "semi-trailer unit" as defined in M.G.L. c. 90, § 1 and includes a motor unit composed of a tractor and a semi trailer.

State Highway or Highway. For the purposes of 700 CMR 8.00, a State Highway is a way owned or controlled by the Department.

Tractor. A motor vehicle with or without a carrying capacity of its own but which is primarily designed and used for drawing another vehicle or for industrial or agricultural purposes.

Trailer.

1. (a) Any vehicle or object on wheels defined as a trailer under M.G.L. c. 90, § 1;
2. (b) For the purposes of 700 CMR 8.15 through 8.18, the word "trailer," as used in 700 CMR 8.15 through 8.18 shall mean any vehicle or object on wheels having no motive power of its own, having two axles spaced apart such that no less than 95% of the trailer's gross weight is bourne by those axles and having air brakes, but which is drawn by, or used in combination with a motor vehicle.