Western Australian Current Regulations Western Australian Current Regulations (1) An agricultural
combination must not be used on a road at night if it exceeds 3.5 m in
width or 25 m in length.
(2) An agricultural
combination, other than a combination mentioned in subregulation (1), may
be used on a road at night if it —
(a) is
fitted with a flashing amber light in accordance with regulation 433 and
that light is operating whenever the combination is being moved on a road; and
(b)
complies with regulations 429, 430, 431 and 432.