Motor Vehicle Safety Regulations — 111
er. (c) [Repealed, SOR/2008-72, s. 2] (15) For the purposes of subsections (16) to (25), (a) cylinders A, D and E shall be 0.305 m (1 foot) high and 0.305 m (1 foot) in diameter; (b) cylinders B and C shall be 0.915 m (3 feet) high and 0.305 m (1 foot) in diameter; and (c) cylinders A, B, C, D and E shall be of a colour that provides a high contrast with the road surface on which the bus is parked. Requirements (16) Every school bus shall have the following two outside mirror systems: (a) System A, which consists, on each side of the school bus, of one unit magnification mirror that conforms to subsection (18) and one convex mirror that conforms to subsection (19); and (b) System B, which consists, on each side of the school bus, of one convex mirror that conforms to subsections (20) to (24). (17) A System A mirror and System B mirror shall conform to the provisions referred to in subsection (16) at any driver’s eye position, when they are adjusted in accordance with the manufacturer’s instructions. (18) Each System A unit magnification mirror shall have a reflective surface area of not less than 325 cm 2 (50 square inches) that provides, at the driver’s eye position, a field of view that includes a continuous view rearward, of the side of the school bus and the road surface, which view shall begin no farther than 60 m (200 feet) rearward of the mirror’s surface and extend to the horizon when measured on a level road, as illustrated in Figure 1. (19) Each System A convex mirror shall (a) provide, at the driver’s eye position, a field of view that includes continuous and complete views as illustrated in Figure 1, (i) rearward, (ii) of the ground, which view overlaps the field of view provided by the unit magnification mirror described in subsection (18), (iii) of the side of the bus, (iv) in the mirror installed on the side opposite the driver’s side, of cylinders B and D, placed in accordance with subsection (25), and (v) in the mirror installed on the driver’s side, of cylinders C and E, placed in accordance with subsection (25); (b) have an average radius of curvature of not less than 482 mm (19 inches); and (c) have a radius of curvature that does not deviate at any point by more than 12.5 per cent from the average of any five radius-of-curvature measurements taken at least 6 mm (0.25 inch) from the edge of the reflective surface. (20) Each System B mirror shall be installed so that (a) the distance from the driver’s eye position to the centre of the mirror is at least 95.25 cm (37.5 inches); and (b) the slope of the mirror surface has no discontinuities. (21) Each System B mirror shall provide a field of view that includes continuous and complete views at the driver’s eye position, as illustrated in Figure 1, of (a) the ground from the front bumper forward to a point where direct observation of the ground is possible; (b) the ground and the side of the bus rearward of the front bumper, extending to and overlapping the field of view provided by the System A convex mirror; (c) in the case of a mirror installed on the side opposite the driver’s side, of cylinders A and B, placed in accordance with subsection (25), and (d) in the case of a mirror installed on the driver’s side, of cylinders A and C, placed in accordance with subsection (25). (22) The images of cylinders A, B and C, placed in accordance with subsection (25), that are reflected in each System B mirror shall meet the following requirements: (a) the shortest angular width of the image shall be no less than 3 minutes of arc, measured using the following equation: X/D ≥ 0,000873 where X is the width of the image of the cylinder on the reflective surface, D is the distance between the centre point of the driver’s eye position and the centre of the reflective surface, and 0.000873 is the tangent of 3 minutes of arc; and (b) the shortest angular length of the image shall be no less than 9 minutes of arc, measured using the following equation: Y/D ≥ 0,002618 where Y is