Western Australian Current Regulations Western Australian Current Regulations (1) The outlet of the
exhaust system fitted to a motor vehicle (except a bus) must
extend —
(a)
behind the back seat; and
(b) at
least 40 mm beyond the outermost joint of the floorpan that is not
continuously welded or permanently sealed; and
(c) to
the edge of the vehicle, if —
(i)
the body of the vehicle is permanently enclosed; and
(ii)
the vehicle is not fitted with a vertical exhaust system;
and
(d) no
further than the edge of the vehicle at its widest point.
(2) The outlet
required by subregulation (1) must discharge the main exhaust flow to the
air —
(a) if
the vehicle is fitted, or required to be fitted, with an exhaust system with a
vertical outlet pipe —
(i)
at an angle above the horizontal; and
(ii)
at least 150 mm above the cab of the vehicle; and
(iii)
rearwards or to the right of the vehicle;
and
(b) in
any other case —
(i)
horizontally or at an angle of not over
45° downwards; and
(ii)
under 750 mm above ground level; and
(iii)
rearwards or to the right of the vehicle.
(3) An exposed section
of a vertical exhaust system fitted to a motor vehicle that is a heavy vehicle
(except a bus) must be positioned or shielded to prevent injury.
(4) The outlet of the
exhaust system fitted to a bus that is a heavy vehicle must —
(a) be
as near as practicable to the rear of the vehicle; and
(b)
extend no further than the edge of the bus at its widest point.
(5) The outlet
required by subregulation (4) must discharge the main exhaust flow to the
air —
(a) if
the bus is fitted, or required to be fitted, with an exhaust system with a
vertical outlet pipe —
(i)
behind the passenger compartment; and
(ii)
at an angle above the horizontal; and
(iii)
upwards or rearwards;
and
(b) in
any other case —
(i)
horizontally or at an angle of not over
45° downwards; and
(ii)
rearwards or to the right of the vehicle.
(6) A vertical exhaust
system fitted to a motor vehicle that is a heavy vehicle must —
(a) if
the vehicle is fitted with an exhaust system with a vertical outlet pipe that
does not direct the main exhaust flow straight up — direct the flow
rearwards at an angle within 0° to 45° of the longitudinal centre
line of the vehicle; and
(b) if a
rain cap is fitted to the outlet pipe — be installed so the hinge
of the cap is at an angle of 90° (plus or minus 10°) to the
longitudinal centre line of the vehicle when viewed from above.
Bus exhaust outlet pipe