Correct answer
A group of three axles forming part of a bogie.
It is a group of three axles forming part of a bogie. Section 1.21 does not define the group by requiring adjacent axle spacing of at most 1.30 m. Spacing does affect mass limits: the trailer and semi-trailer table distinguishes spacing up to 1.30 m from spacing above 1.30 m up to 1.40 m. Do not confuse these mass-limit intervals with the group definition.
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Any three-axle vehicle, even when its axles do not form a bogie.
A group of three axles forming part of a bogie.
Only a group of three axles with every adjacent spacing at most 1.30 m.
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