For the purposes of this Directive:
1. "vehicle" means any motor vehicle intended for travel on land and propelled by mechanical power, but not running on rails, and any trailer, whether or not coupled;
2. "injured party" means any person entitled to compensation in respect of any loss or injury caused by vehicles;
3. "national insurers' bureau" means a professional organization which is constituted in accordance with Recommendation No 5 adopted on 25 January 1949 by the Road Transport Sub-committee of the Inland Transport Committee of the United Nations Economic Commission for Europe and which groups together insurance undertakings which, in a State, are authorized to conduct the business of motor vehicle insurance against civil liability;
4. "territory in which the vehicle is normally based" means the territory of the State in which the vehicle is registered; or - the territory of the State of which the vehicle bears a registration plate, irrespective of whether the plate is