Western Australian Current Regulations Western Australian Current Regulations (1) A motor vehicle,
except an articulated bus, must have only —
(a) one
axle group or single axle towards the front of the vehicle; and
(b) one
axle group or single axle towards the rear of the vehicle.
(2) An articulated bus
must have —
(a) on
its front section —
(i)
only one axle group or single axle towards the front of
the section; and
(ii)
only one axle group or single axle towards the rear of
the section;
and
(b) on
another section — only one axle group or single axle.
(3) A trailer must
have only —
(a) one
axle group or single axle; or
(b)
2 axle groups, 2 single axles or one axle group and single axle, in
this configuration —
(i)
one axle group or single axle towards the front of the
vehicle, with all the wheels on the axle group or single axle connected to the
steering mechanism for that part of the trailer; and
(ii)
one axle group or single axle towards the rear of the
vehicle.
(4) A
semi‑trailer that is extendible or is fitted with sliding axles
must —
(a) have
a securing device that —
(i)
can securely fix the extendible part or sliding axles to
the rest of the vehicle in any position of adjustment provided; and
(ii)
is located in a position that can prevent accidental or
inadvertent release, if the device is mounted on the chassis of the vehicle;
and
(iii)
is fitted with a visible or audible warning system to
indicate to a person standing beside the vehicle that the device is not
engaged; and
(iv)
is fitted with a way of preventing loss of air from the
air brake supply, if the device uses air from the brake system and fails in a
way allowing air to escape; and
(v)
is held in the applied position by direct mechanical
action without the intervention of an electric, hydraulic or pneumatic device;
and
(b) be
built so the adjustable parts of the vehicle remain connected if the securing
device fails.