2.1 If, in the application to a vehicle of a portion of a section of these Regulations or a portion of a provision of a technical standards document, either the metric or the imperial system of measurement is used, the same system of measurement shall be used in the application to the vehicle of any other portion of the section or provision.

2.2 For the purpose of determining the number of wheels on a motorcycle or a three-wheeled vehicle, two wheels are considered to be one wheel if they are mounted on the same axle and the distance between the centres of their areas of contact with the ground is less than 460 mm.

• 2.3 (1) Subject to subsections (2) and (3), the designated seating capacity of a vehicle is the sum of the number of designated seating positions and wheelchair locations in the vehicle.

• (2) The designated seating capacity of a motor home that has a GVWR greater than 4 536 kg may, at the option of the manufacturer, be the number of sleeping positions in the motor home.

• (3) If a folding or removable seat is positioned at one or more wheelchair locations, the greater of the following shall be used for the purposes of subsection (1):

  • (a) the number of designated seating positions that the seat contains, and

  • (b) the number of wheelchair locations.

• 2.4 (1) In subsection (3), “measurement zone” means the zone extending from a transverse vertical plane that is 150 mm behind the front leading surface of a seating surface to a transverse vertical plane that is 250 mm behind that front leading surface, measured horizontally and longitudinally.

• (2) If a location in a vehicle that is likely to be used as a seating position has a seating surface width of at least 700 mm, the number of designated seating positions at that location shall be determined by using whichever of the following formulae is applicable and rounding the quotient down to the nearest whole number:

  • (a) if the location has a seating surface width of less than 1 400 mm,

    N = W / X

    where

    N 

    is the number of designated seating positions,

    W 

    is the seating surface width in millimetres, and

    X 

    is 350 or, at the option of the manufacturer, a number that is chosen by the manufacturer and is less than 350 but not less than 330; and

  • (b) if the location has a seating surface width of 1 400 mm or more,

    N = W / X

    where

    N 

    is the number of designated seating positions,

    W 

    is the seating surface width in millimetres, and

    X 

    is 450 or, at the option of the manufacturer, a number that is chosen by the manufacturer and is less than 450 but not less than 330.

• (3) Adjacent seating surfaces are considered to form a single seating surface, unless

  • (a) the seating surfaces are separated by a fixed trimmed surface that has an unpadded top surface and that has a width of not less than 140 mm in each transverse vertical plane, as measured in the measurement zone;

  • (b) the seating surfaces are separated by a void whose cross section in each transverse vertical plane within the measurement zone is a rectangle that is not less than 140 mm wide and not less than 140 mm deep, and the top edge of the cross section in each of those planes is congruent with the transverse horizontal line that intersects the lowest point on the portion of the top profile of the seating surfaces that lie within the plane;

  • (c) interior trim interrupts a line drawn between the H-points of adjacent seating surfaces; or

  • (d) the seating surfaces are adjacent outboard seats, and the lateral distance between each point on the seat cushion of one seat and each point on the seat cushion of the other seat is not less than 140 mm.

• (4) Folding, removable and adjustable seats must be measured in the configuration that results in the largest seating surface width.

• (5) The number of designated seating positions in a bench type seat in a school bus shall be the number of seating positions determined in accordance with subsection 222(5) of Schedule IV.