Western Australian Current Regulations Western Australian Current Regulations (1) Subject to
subregulation (2), an agricultural combination must not travel at a speed
exceeding 20 km/h below the local speed limit or, where the local speed
limit is 80 km/h or more, 80 km/h.
(2) If a motor vehicle
is being towed in an agricultural combination, the agricultural combination
must not travel at a speed exceeding 20 km/h below the local speed limit
or, where the local speed limit is 70 km/h or more, 50 km/h.