The exemption under clause 12 of a person using, or causing or permitting the use of, a tandem-drive prime mover is subject to the following conditions:

(a) the combination must have axle groups with at least 1.2 metre spacings;

(b) the combination must comply with the mass limits set out in Schedule 5 ;

(c) the manufacturer's axle load limits and tyre load limits must not be exceeded;

(d) the gross mass of the combination must not exceed the lesser of the following:

(i) the manufacturer's GCM;

(ii) if the distance between the centre of the rear drive axle and the centre of the first trailer axle is 6 metres or more, 49.50 tonnes;

(iii) if the distance between the centre of the rear drive axle and the centre of the first trailer axle is less than 6 metres, 49.50 tonnes decreased by 1 tonne for each 300 millimetres by which that distance is less than 6 metres.