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MOTOR VEHICLE SAFETY ACTMotor Vehicle Safety RegulationsStandard 505
505. (1) Subject to subsection (2), the height of the centre of mass, shown in Figure 1, of a motor tricycle or a three-wheeled vehicle shall not exceed one and a half times the horizontal distance from the centre of mass to the nearest roll axis, shown in Figure 2. (2) Subsection (1) does not apply to a motor tricycle designed in such a way that it leans during a turning manoeuvre in the same direction as the turn. (3) The total weight of a motor tricycle or three-wheeled vehicle on all its front wheels, as measured at the tire-ground interfaces, shall be not less than 25 per cent and not greater than 70 per cent of the loaded weight of that vehicle. (4) The loaded weight of a motor tricycle or three-wheeled vehicle and the location of its centre of mass shall be determined under the following conditions:
(5) For a motor tricycle or three-wheeled vehicle with one wheel at the front and two wheels at the rear, the horizontal distance from the centre of mass to the nearest roll axis, shown in Figure 2, shall be determined using the equation d = L sin (arctan (t / 2W)) where d is the horizontal distance from the centre of mass to the nearest roll axis; L is the longitudinal distance between the centre of mass and the centre of the front axle; t is the width of the wheel track of the rear axle; and W is the wheelbase. (6) For a motor tricycle or three-wheeled vehicle with two wheels at the front and one wheel at the rear, the horizontal distance from the centre of mass to the nearest roll axis, shown in Figure 2, shall be determined using the equation d = (W - L) sin ( arctan (t / 2W)) where d is the horizontal distance from the centre of mass to the nearest roll axis; W is the wheelbase; L is the longitudinal distance between the centre of mass and the centre of the front axle; and t is the width of the wheel track of the front axle. (7) Motor tricycles manufactured before September 1, 2004 need not comply with this section. ![]() Legend h is the height of the centre of mass L is the longitudinal distance between the centre of mass and the centre of the front axle W is the wheelbase Figure 1 — Side View
![]() Legend d is the horizontal distance from the centre of mass to the nearest roll axis t is the width of the wheel track of the front or rear axle W is the wheelbase Figure 2 — Top View
Established by:SOR/2003-272 24 July, 2003 pursuant to section 5 and subsection 11(1) of the Motor Vehicle Safety Act, comes into force 24 July, 2003. Schedule IV is amended by adding section 505 after section 500.
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