In relation to a trailer used in a heavy combination, the front articulation point means the point of articulation at the front of the trailer, which may, and may only, be any of the following:
the vertical axis of a kingpin used with a fifth wheel coupling;
the vertical axis of rotation of a fifth wheel coupling;
the vertical axis of rotation of a turntable;
in relation to a trailer that is a dog trailer, the vertical axis of rotation of the front axle group, or single axle, of the trailer;
in relation to a trailer that is a semitrailer or tag trailer, the imaginary vertical line passing through the pivot point for a coupling fitted to the semitrailer or tag trailer.
Examples—
 Point of articulation—fifth wheel coupling on a converter dolly (forming the front axle group of a dog trailer)
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 Point of articulation—kingpin fitted to a fifth wheel coupling |