In this task, you are provided with an article about the legal acts. Your task is to generate a headline for that article.

For the purposes of this Directive, 'vehicle' means any motor vehicle intended for use on the road, with or without bodywork, having at least four wheels and a maximum design speed exceeding 25 km/h, with the exception of vehicles which run on rails, agricultural tractors and machinery and engineering plant. No Member State may refuse to grant EEC type approval or national type approval of a vehicle on grounds relating to the device to prevent unauthorized use if such device meets the requirements set out in Annex I. No Member State may refuse or prohibit the sale, registration, entry into service or use of any vehicle on grounds relating to the device to prevent unauthorized use if such device meets the requirements set out in Annex I. The Member State which has granted type approval shall take the necessary measures to be informed of any modification of a part or characteristic referred to in item 2.2. of Annex I. The competent authorities of that State shall determine whether fresh tests should be carried out on the modified vehicle and a fresh report drawn up. Where such tests reveal failure to comply with the requirements of this Directive, the modification shall not be approved.  (1)OJ No C 112, 27.10.1972, p. 16. (2)OJ No C 60, 26.7.1973, p. 12. (3)OJ No L 42, 23.2.1970, p. 1. (4)EEC, Geneva, E/ECE/324 - E/ECE/TRANS/505/Rev. Add. 17. The amendments necessary for- adjusting the requirements of Annexes I and II so as to take account of technical progress shall be adopted in accordance with the procedure laid down in Article 13 of the Council Directive of 6 February 1970 on the harmonization of the laws of the Member States relating to the type-approval of motor vehicles and their trailers. 1. Member States shall put into force the provisions needed in order to comply with this Directive within eighteen months of its notification and shall forthwith inform the Commission thereof.2. Member States shall ensure that the texts of the main provisions of national law which they adopt in the field covered by this Directive are communicated to the Commission. This Directive is addressed to the Member States.
Council Directive on the approximation of the laws of the Member States relating to devices to prevent the unauthorized use of motor vehicles