Scheme F is an implementation of the FHWA's visual classification scheme as an axle-based classification scheme. This is one of several interpretations.
Axles | Class | Description | SP1 | SP2 | SP3 | SP4 | SP5 | Aggregate |
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2 | F1 | motorcycle | < 6.0 | | | | | 1 (Light) |
F2 | passenger car or light pickup | 6.0 - 10.0 | | | | | 1 |
F3 | heavy pickup | 10.0 - 15.0 | | | | | 1 |
F5 | two-axle truck | 15.0 - 20.0 | | | | | 2 (Medium) |
F4 | bus | > 20.0 | | | | | 2 |
3 | F2 | car with trailer | < 10.0 | 10.0 - 18.0 | | | | 1 |
F3 | pickup with trailer | 10.0 - 15.0 | 10.0 - 18.0 | | | | 1 |
F4 | bus | > 19.0 | | | | | 2 |
F8 | 2S1 | | > 18.0 | | | | 3 (Heavy) |
F6 | three-axle truck | | | | | | 2 |
4 | F2 | car with trailer | < 10.0 | | < 3.5 | | | 1 |
F3 | pickup with trailer | 10.0 - 15.0 | | < 3.5 | | | 1 |
F8 | 2S2 | | > 5.0 | > 3.5 | | | 3 |
F8 | 3S1 | | < 5.0 | > 10.0 | | | 3 |
F7 | four-axle truck | | | | | | 2 |
5 | F11 | 2S1-2 | | > 6.0 | | | | 3 |
F9 | 3S2 | | < 6.1 | | 3.5 - 8.0 | | 3 |
F3 | pickup with trailer | 9.9 - 15.0 | | | < 3.5 | | 1 |
F5 | two-axle truck with trailer | 14.9 - 20.0 | | | < 3.5 | | 2 |
F9 | five-axle combination | | | | | | 3 |
6 | F10 | six-axle combination | | | 3.5 - 5.0 | | | 3 |
F12 | 3S1-2 | | | | | > 10.0 | 3 |
F10 | 3S3 | | | | | | 3 |
>=7 | F13 | seven (or more) axle combination | | | | | | 3 |