jswizzle3737/ontario_laws_and_regs huggingface dataset:
1. In this Regulation, “fifth wheel assembly” means a coupling device having its lower-half mounted on the rear portion of a vehicle frame or the frame of a trailer converter dolly and its upper-half fastened to the underside of the forward portion of a semi-trailer for the purpose of supporting and towing the semi-trailer; (“sellette d’attelage”) “full trailer” means a vehicle that is towed by another vehicle and is so designed and used that the whole of its weight and load is carried on its own axles and includes a combination consisting of a semi-trailer and a trailer converter dolly; (“remorque autoporteuse”) “semi-trailer” means a vehicle that is towed by another vehicle and is so designed and used that a substantial part of its weight and load rests on or is carried by the other vehicle or a trailer converter dolly through a fifth wheel assembly; (“semi-remorque”) “tow bar” means a towing structure that is connected to the chassis frame of the forward axle of a full trailer and which includes an eye or equivalent device for the purpose of coupling with a trailer hitch; (“barre d’attelage”) “trailer converter dolly” means a device consisting of one or more axles, a fifth wheel lower-half and a tow bar used to convert a semi-trailer into a full trailer; (“avant-train à sellette”) “trailer hitch” means a coupling device mounted on the rear of a truck tractor or trailer to which a tow bar may be attached for the purpose of towing a full trailer. (“fourche d’attelage”)  R.R.O. 1990, Reg. 618, s. 1.
2. Where a truck tractor and one or more trailers are operated in combination, the coupling devices connecting the truck tractor and trailer or trailers shall be designed, constructed and installed and the truck tractor, trailer or trailers shall be designed and constructed so that when they are operated in combination in a straight line on a level, smooth, paved surface, the path of the trailer or trailers does not swing or deviate more than 76 millimetres to either side of the path or the truck tractor.  R.R.O. 1990, Reg. 618, s. 2.
3. (1) The lower-half of a fifth wheel assembly on a truck tractor, trailer or trailer converter dolly shall be attached to the frame of the truck tractor, trailer or trailer converter dolly with a mounting that, (a) has, (i) brackets, mounting plates or angles, and (ii) bolts or equivalent devices, which together will withstand a force, applied at the coupling point of the fifth wheel assembly, equivalent to the gross weight of the trailer or trailers being towed without residual deformation to the mounting parts; (b) is installed so that the frame of the truck tractor, trailer or converter dolly does not crack or become deformed; and (c) is installed so as to prevent shifting of the lower-half of the fifth wheel assembly on the frame to which it is attached.  R.R.O. 1990, Reg. 618, s. 3 (1). (2) Where the upper-half of a fifth wheel assembly is attached to a semi-trailer it shall be attached to the underside of the semi-trailer so as to prevent, (a) warping or cracking of the upper-half of the fifth wheel assembly or the underside of the semi-trailer; and (b) separation of the upper-half of the fifth wheel assembly from the semi-trailer.  R.R.O. 1990, Reg. 618, s. 3 (2). (3) A fifth wheel assembly shall be equipped with a locking device that prevents separation of its upper-half from its lower-half.  R.R.O. 1990, Reg. 618, s. 3 (3). (4) Where a fifth wheel assembly includes a manual release system, the fifth wheel assembly shall be equipped with a locking device or devices which applies automatically on the coupling of a semi-trailer to a truck tractor, trailer converter dolly or to another semi-trailer.  R.R.O. 1990, Reg. 618, s. 3 (4). (5) The lower-half of a fifth wheel assembly on a truck tractor, trailer or trailer converter dolly shall be so mounted in relation to the axles of the truck tractor, trailer or trailer converter dolly that, (a) the load distribution does not unduly interfere with the steering, braking or maneuverability of the truck tractor, trailer or trailer converter dolly; and (b) the combination operates safely.  R.R.O. 1990, Reg. 618, s. 3 (5).
4. (1) A full trailer shall be equipped with a tow bar that is of sufficient strength to withstand a force through its attachments equivalent to the gross weight of the trailer or trailers being towed, without residual deformation to the tow bar.  R.R.O. 1990, Reg. 618, s. 4 (1). (2) Where a tow bar is used to tow a full trailer it shall be connected to the full trailer with an attachment that, (a) has a strength equal to or greater than that of the tow bar; (b) in the case of a hinged tow bar, has the minimum clearance necessary for adequate articulation; and (c) is attached in the manner for which it was designed.  R.R.O. 1990, Reg. 618, s. 4 (2). (3) Where a truck tractor or trailer is equipped with a trailer hitch, the trailer hitch shall, (a) be of sufficient strength to withstand a force applied at the point to which the tow bar is connected, equivalent to the gross weight of the trailer or trailers being towed, without residual deformation to the trailer hitch; (b) provide the minimum clearance necessary for adequate articulation in its connection to the trailer being towed; and (c) be provided with a locking device to prevent accidental separation of the truck tractor or trailer from the trailer being towed.  R.R.O. 1990, Reg. 618, s. 4 (3). (4) The attachment of a trailer hitch to the towing structure of a truck tractor or trailer shall have a strength that is equal to or greater than that of the trailer hitch.  R.R.O. 1990, Reg. 618, s. 4 (4). (5) A towing structure to which a trailer hitch is attached, shall have a strength equal to or greater than that of the trailer hitch.  R.R.O. 1990, Reg. 618, s. 4 (5). (6) The attachment of a towing structure to a truck tractor or trailer shall, (a) be reinforced or braced to prevent distortion of the frame of the truck tractor or trailer; and (b) have a strength equal to or greater than that of the trailer hitch.  R.R.O. 1990, Reg. 618, s. 4 (6).