3.
For the following vehicles, the manufacturer may choose whether to apply for approval under this Regulation or whether to comply with the relevant national requirements: trailers (category R) and interchangeable towed equipment (category S); track-laying tractors (category C); special purpose wheeled tractors (categories T4.1 and T4.2).
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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.