ARX is a modification of AustRoads94. It removes class 12, moves all other classes up by one, and inserts a cycle class as class 1.
| Axles | Groups | Description | Class | Parameters | Dominant Vehicle | Aggregate |
|---|
| 2 | 1 or 2 | Very Short - Bicycle or Motorcycle | MC | 1 | d(1)<1.7m & axles=2 | | 1 (Light) |
| 2 | 1 or 2 | Short - Sedan, Wagon, 4WD, Utility, Light Van | SV | 2 | d(1)>=1.7m, d(1)<=3.2m & axles=2 | |
| 3, 4 or 5 | 3 | Short Towing - Trailer, Caravan, Boat, etc. | SVT | 3 | groups=3, d(1)>=2.1m, d(1)<=3.2m, d(2)>=2.1m & axles=3,4,5 | |
| 2 | 2 | Two axle truck or Bus | TB2 | 4 | d(1)>3.2m & axles=2 | | 2 (Medium) |
| 3 | 2 | Three axle truck or Bus | TB3 | 5 | axles=3 & groups=2 | |
| >3 | 2 | Four axle truck | T4 | 6 | axles>3 & groups=2 | |
| 3 | 3 | Three axle articulated vehicle or Rigid vehicle and trailer | ART3 | 7 | d(1)>3.2m, axles=3 & groups=3 | | 3 (Heavy) |
| 4 | >2 | Four axle articulated vehicle or Rigid vehicle and trailer | ART4 | 8 | d(2)<2.1m or d(1)<2.1m or d(1)>3.2m axles = 4 & groups>2 | |
| 5 | >2 | Five axle articulated vehicle or Rigid vehicle and trailer | ART5 | 9 | d(2)<2.1m or d(1)<2.1m or d(1)>3.2m axles=5 & groups>2 | |
| >=6 | >2 | Six (or more) axle articulated vehicle or Rigid vehicle and trailer | ART6 | 10 | axles=6 & groups>2 or axles>6 & groups=3 | |
| >6 | 4 | B-Double or Heavy truck and trailer | BD | 11 | groups=4 & axles>6 | |
| >6 | >=5 | Double or triple road train or Heavy truck and two (or more) trailers | DRT | 12 | groups>=5 & axles>6 | |