(a)
in the case of a single or multiple axle, the forward edge (C) must extend forwards to reach a line O-Z where Θ (theta) is no more than 45° above the horizontal. The rearmost edge (Figure 2 of Annex VI) must extend downwards in such a way as not to be more than 100 mm above a horizontal line passing through the centre of the wheel;
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Source: EUR-Lex (Cellar) · retrieved 2026-11-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.