(a) "Motor vehicles" are all vehicles propelled by any power other than muscular power, excepting road rollers, street sweepers and sprinklers, lawn mowers or vehicles which run only on rails or tracks. Trailers, having two or more wheels, when propelled or intended to be propelled by attachment to a motor vehicle, shall be classified as separate motor vehicles with no power rating. "Passenger automobiles" include all pneumatic tired motor vehicles of types similar to those usually known under the following terms: touring car, speedster, roadster, cycle car (except motor wheel and similar small outfits which are classified with motorcycles), coupe, landaulet, closed car, limousine, cabriolet, sedan, etc. Motor vehicles with changed or rebuilt bodies, using a chassis of the usual pneumatic tired passenger automobile type, shall also be classified as passenger automobiles, provided their net allowable carrying capacity as determined under sections twenty and twenty-one of this Act, does not exceed eight passengers and provided they are not used primarily for carrying freight or merchandise.
(b) "Highways" include every public thoroughfare, every public boulevard, driveway, avenue, park, parkway, plaza, square, place, street, road, alley, and callejon.
(c) "Chauffeur" includes every and any licensed operator of a motor vehicle, except an owner operating his own motor vehicle not for hire.
(d) "Operating" and the other inflection of that verb signify running, driving, guiding, controlling, or conducting a motor vehicle.
(e) "Operator" includes every person operating a motor vehicle whether he be or be not licensed to do so.
(f) "Owner" includes, when the context requires it, in addition to the actual legal owner of a motor vehicle or trailer, also every person for the time being in legal possession of such motor vehicle and lawfully entitled to give commands and directions with regard to the same, but not a person who has rented or hired such motor vehicle or trailer from a garage. In as far as concerns publicly owned motor vehicles or trailers, the "owner" in the contemplation of this Act, is the head of the office or the chief of the bureau to which the said motor vehicle or trailer belongs except when the context requires a different interpretation.
(g) "Dealer" includes every person, association, partnership or corporation making, manufacturing, constructing, assembling, or setting up motor vehicles or trailers in these Islands for sale; and every person, association, partnership or corporation, acting as agent for the sale of one or more makes, styles, or kinds of motor vehicles, dealing in motor vehicles, keeping the same in stock, or selling same or handling with a view of trading in same.
(h) "Dealer's certificate" means a certificate of registration issued to a dealer as defined in the last preceding subsection.
(i) "Garage" includes every place where motor vehicles belonging to persons other than the owner of such garage are housed, stored, kept or repaired for payment, and every place where motor vehicles are housed, stored, or kept to let or for hire to the public, with the exception of street stands or other public places designated by proper municipal authority as parking space for motor vehicles for hire, while awaiting or soliciting passengers or business.
(j) "Proprietor of a garage" includes every proprietor" and owner of a garage as defined in the last preceding subsection, and every person in control or charge of such garage in his own behalf or in behalf of the owner or proprietor.
(k) "Intersection" includes every part of a public highway which joins another at an angle, whether or not it crosses the other.
(l) "Horn" shall include every device for signaling by sound.
(m) "Gross weight" includes the measured weight of a motor vehicle in running condition, as determined by the Director of Public Works or his deputies, plus the maximum allowable carrying capacity in merchandise, freight or passengers, as determined by the Director of Public Works or his deputies. For the determination of carrying capacity, the weight of a passenger shall be assumed arbitrarily as fifty kilos exclusive of personal or other baggage.
(n) "The Director of Public Works," except where expressly stated otherwise, is defined as the actual or acting chief of the Bureau of Public Works.
(o) "The Director of Public Works or his deputies" is defined as the actual or acting chief of the Bureau of Public Works or such representatives, deputies, agents, or assistants, as he may, with the approval of the Secretary of Commerce and Communications, authorize or detail in writing for the purposes contemplated by this Act.