Scheme F
Scheme F is an implementation of the FHWA's visual classification scheme as an axle-based classification scheme. This is one of several interpretations.
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Units: Non-metric (ft)
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Car class: 2
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Unclassifiable vehicle class: 14
| Axles | Class | Description | SP1 | SP2 | SP3 | SP4 | SP5 | Aggregate |
|---|---|---|---|---|---|---|---|---|
| 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 |