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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.

  • Units: Non-metric (ft)

  • Car class: 2

  • Unclassifiable vehicle class: 14

AxlesClassDescriptionSP1SP2SP3SP4SP5Aggregate
2F1motorcycle< 6.0    1 (Light)
F2passenger car or light pickup6.0 - 10.0    1
F3heavy pickup10.0 - 15.0    1
F5two-axle truck15.0 - 20.0    2 (Medium)
F4bus> 20.0    2
3F2car with trailer< 10.010.0 - 18.0   1
F3pickup with trailer10.0 - 15.010.0 - 18.0   1
F4bus> 19.0    2
F82S1 > 18.0   3 (Heavy)
F6three-axle truck     2
4F2car with trailer< 10.0 < 3.5  1
F3pickup with trailer10.0 - 15.0 < 3.5  1
F82S2 > 5.0> 3.5  3
F83S1 < 5.0> 10.0  3
F7four-axle truck     2
5F112S1-2 > 6.0   3
F93S2 < 6.1 3.5 - 8.0 3
F3pickup with trailer9.9 - 15.0  < 3.5 1
F5two-axle truck with trailer14.9 - 20.0  < 3.5 2
F9five-axle combination     3
6F10six-axle combination  3.5 - 5.0  3
F123S1-2    > 10.03
F103S3     3
>=7F13seven (or more) axle combination     3