A new general safety regulation for vehicles of category Y, which are not designed to carry occupants, adds provisions requiring repetition of tests described in Annex 3 and Annex 4 when modifications affect the general form of vehicle structure or increase mass by more than eight per cent. For modifications affecting only interior fittings or mass increases not exceeding eight per cent, a simplified test in accordance with UN R94 in its 05 series of amendments or a partial test shall be carried out. The regulation incorporates requirements from UN R94, UN R95, UN R137, and UN R153, and proposes exempting vehicles with maximum design speed not exceeding 50 and 56 km/h from impact test procedures while requiring compliance with post-impact requirements.