The exemption under clause 19 of a person using, or causing or permitting the use of, a vehicle or combination carrying hay is subject to the following conditions:

(a) the vehicle or combination, inclusive of its load, must not exceed 3 metres in width;

(b) a combination consisting of a prime mover and a tri-axle semi-trailer, inclusive of its load, may be up to 4.6 metres in height provided the width of the combination, inclusive of its load, does not exceed 2.5 metres;

(c) a step-deck or drop-well tri-axle semi-trailer with a maximum lower loading deck height of 1.2 metres may be loaded up to 4.6 metres in height and 3.0 metres in width;

(d) if the vehicle or combination is more than 2.5 metres in width, it must display an oversize vehicle warning sign specified in Division 2 of Part 2 of Schedule 3 to the Vehicle Operations Regulations on the front and rear of the vehicle or combination.