The exemption under clause 17 of a person using, or causing or permitting the use of, a motor 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 tri-axle semi-trailer inclusive of its load may be 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 to 4.6 metres high and 3.0 metres wide;

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