Definitions
1. In this Regulation, “aggregate vehicle” means a vehicle or combination of vehicles that is designed for dumping or spreading of sand, gravel, crushed or uncut rock, asphalt, slag, rubble, or any mixture thereof and that is transporting a load consisting mostly of any of these materials; “axle spread” means the longitudinal distance between the centres of the foremost and rearmost axles of an axle unit; “base length” means the distance measured between the centres of the first axle of the front axle of a vehicle or combination of vehicles and the last axle of a vehicle or combination of vehicles; “carbon dioxide tank semi-trailer” means a triaxle tank semi-trailer that is in carbon dioxide service and that, (a) was built to Transport Canada specification TC331 or United States Department of Transportation specification MC331, and (b) bears the appropriate specification number on the compliance label or manufacturer’s identification plate affixed to the vehicle; “cryogenic tank semi-trailer” means a tank semi-trailer that was built to Canadian Gas Association specification CGA341 or Transport Canada specification TC341 and bears the appropriate specification number on the compliance label or manufacturer’s identification plate affixed to the vehicle; “effective overhang” means the longitudinal distance from the centre of the tandem axle, in the case of a self-steer triaxle semi-trailer, or from the centre of the tridem axle, in the case of a self-steer quad semi-trailer, to its rearmost point, including any load; “end dump semi-trailer” means a semi-trailer to which is permanently attached a body or box that is hinged and can be raised to dump from the rear of the semi-trailer; “front axle weight” for, (a) an aggregate vehicle means, (i) for a single front axle, the maximum weight permitted under section 116 of the Act for a single axle, (ii) for a dual front axle, one-half the maximum weight permitted under section 116 of the Act for a dual axle, and (iii) for a triple front axle, one-third the maximum weight permitted under section 116 of the Act for a triple axle, and (b) a vehicle or combination of vehicles that is not an aggregate vehicle means, (i) for a single front axle, the axle unit weight on the front axle, or, if that weight is more than the maximum weight permitted for a single axle under section 116 of the Act, the maximum weight permitted for a single axle under section 116 of the Act, (ii) for a dual front axle, one-half of the axle unit weight on the dual front axle, or, if that weight is more than one-half of the maximum weight permitted for a dual axle under section 116 of the Act, one-half of the maximum weight permitted for a dual axle under section 116 of the Act, (iii) for a triple front axle, one-third of the axle unit weight for the triple front axle, or, if that weight is more than one-third of the maximum weight permitted for a triple axle under section 116 of the Act, one-third of the maximum weight permitted for a triple axle under section 116 of the Act; “inter-axle spacing” means the longitudinal distance separating two consecutive axle units within a vehicle or combination of vehicles, measured from the centre of the rearmost axle of the foremost axle unit to the centre of the foremost axle of the other axle unit; “inter-vehicle-unit distance”, for a combination of vehicles, means the lesser of, (a) the distance between the centres of the last axle of the motor vehicle or road building machine and the first axle of the towed vehicle, and (b) the distance between the centres of the last axle of the first towed vehicle and the first axle of the second towed vehicle; “intra-vehicle-unit distance”, for a five or six axle vehicle without a towed vehicle, means the greater of, (a) the distance between the centres of the second and third axles from the front of the vehicle, and (b) the distance between the centres of the third and fourth axles from the front of the vehicle; “number of axles” means the total number of axles on a vehicle or combination of vehicles that are transmitting weight to the highway; “open-top hopper dump semi-trailer” means a semi-trailer to which is permanently attached an opened-top body or box with bottom hoppers that can be opened to dump from the bottom of the semi-trailer; “self-steering axle” means an assembly of two or more wheels whose centres are in one transverse vertical plane and whose wheels can articulate in response to forces generated between the tires and the road or through mechanisms and linkages that operate independently of the driver; “single semi-trailer” means a semi-trailer that is the only trailer in a tractor-trailer combination; “tag-axle tank semi-trailer” means a tank semi-trailer, (a) that is not more than 14.65 metres in length, (b) that is equipped with a rear single axle and a front tandem axle, whose inter-axle spacing is more than 2.5 metres, (c) whose single axle, (i) is a self-steering axle capable of turning 20 degrees in either direction, and (ii) is not a liftable axle, and (d) whose axles automatically load equalize; “tandem axle” means a dual axle that does not include a liftable axle or a self-steering axle and that has the same number of tires on each wheel; “tank semi-trailer” means a triaxle semi-trailer that is permanently attached to a closed tank having a capacity of 2.3 kilolitres or more; “tractor” means a commercial motor vehicle designed to draw one or more semi-trailers to which it is coupled by means of a fifth wheel assembly; “triaxle semi-trailer” means any three-axle single semi-trailer that does not have a tridem axle; “tridem axle” means a triple axle that does not include a liftable axle or a self-steering axle and that has the same number of tires on each wheel; “wheelbase” means the longitudinal distance from the centre of the kingpin to the centre of the tandem or tridem axle of the semi-trailer, as the case may be. R.R.O. 1990, Reg. 597, s. 1; O. Reg. 355/96, s. 1; O. Reg. 668/00, s. 2 (2); O. Reg. 186/02, s. 1. Allowable Gross Vehicle Weights