Self-Steer Quad Semi-Trailer
5. (1) For the purposes of sections 6, 7 and 10, a semi-trailer is a self-steer quad semi-trailer if,  (a) the combination of vehicles of which it forms part meets the description shown in Figure 2; (b) the distance between the rear axle of the tractor and the single axle of the trailer is as described in subsection (2); (c) the tractor is as described in subsection (3); and (d) the semi-trailer shows evidence of, (i) compliance under subsection (4) with respect to its manufacture, or (ii) compliance under subsection (5) with respect to its conversion.  O. Reg. 668/00, s. 5. (2) The distance between the rear axle of the tractor and the single axle of the trailer is, (a) at least 6 metres, if the axle spread of the tridem axle of the semi-trailer is at least 3 metres and less than 3.6 metres; and (b) at least 5.5 metres, if the axle spread of the tridem axle of the semi-trailer is at least 3.6 metres and not more than 3.7 metres. O. Reg. 668/00, s. 5. (3) The tractor has the following characteristics: 1. It has a front axle equipped with single tires and a rear tandem axle that has an axle spread of at least 1.2 metres and not more than 1.85 metres. 2. It is not equipped with a liftable axle or a self-steering axle, whether raised, lowered or rendered inoperative. 3. If the single axle of the semi-trailer is liftable, the tractor, i. is not equipped with nor does it contain any device, whether remote or manual, that would allow the liftable axle to be controlled by the driver, and ii. is not equipped with automatic controls that activate other than when reversing. O. Reg. 668/00, s. 5. (4) The semi-trailer has the following characteristics: 1. Its length does not exceed 14.65 metres. 2. It has four axles, consisting of a front single axle and a rear tridem axle. 3. The inter-axle spacing between the single axle and the tridem axle is more than 2.5 metres but not more than 3 metres. 4. The single axle is a self-steering axle and is capable of turning 20 degrees in either direction. 5. If the single axle is equipped with single tires, the width is imprinted on each of them and is least, i. 365 millimetres, if the axle spread of the tridem axle is at least 3 metres and less than 3.6 metres, or ii. 385 millimetres, if the axle spread of the tridem axle is at least 3.6 and not more than 3.7 metres. 6. The tridem axle has an axle spread of at least 3 metres and not more than 3.7 metres. 7. The four axles automatically load equalize when the single axle is deployed. 8. The effective overhang does not exceed 35 per cent of the semi-trailer’s wheelbase. 9. If it is required under section 6 to have a rear impact guard, it is equipped with a rear impact guard that meets the requirements of that section. 10. If the single axle of the semi-trailer is liftable, the semi-trailer may be equipped with manual controls but may not be equipped with automatic controls that activate other than when reversing. 10.1 If it is equipped with one liftable axle in addition to the axles required by paragraph 2, the additional axle is positioned in front of all other axles, and it is raised when the vehicle is operated on the highway. 11. It is equipped with, i. a device that accurately displays the total weight on the trailer axles in kilograms, or ii. a device and a table or chart, from the combined use of which the total weight on the trailer axles in kilograms may be readily and accurately obtained. O. Reg. 668/00, s. 5; O. Reg. 186/02, s. 3. (5) The semi-trailer bears its original compliance label and the notation “Reg 597 (Ont) — 4”, signifying that the semi-trailer was manufactured to the specifications set out in subsection (4), is on that label or the semi-trailer’s manufacturer’s identification plate. O. Reg. 668/00, s. 5. (6) If the semi-trailer was not manufactured to the specifications set out in subsection (4), (a) it has been converted by a company authorized under the Motor Vehicle Safety Act (Canada) to apply a national safety mark or by an authorized dealer of such a company; (b) that person placed a label adjacent to the original compliance label indicating revised gross vehicle and axle weight ratings; and (c) that label includes the notation “Reg 597 (Ont) — 4”, signifying that the trailer was converted to the specifications in subsection (4). O. Reg. 668/00, s. 5. Rear Impact Guards