1. The object of Articles 20 to 26 is to lay down special provisions applicable to injured parties entitled to compensation in respect of any loss or injury resulting from accidents occurring in a Member State other than the Member State of residence of the injured party which are caused by the use of vehicles insured and normally based in a Member State.
Without prejudice to the legislation of third countries on civil liability and private international law, these provisions shall also apply to injured parties resident in a Member State and entitled to compensation in respect of any loss or injury resulting from accidents occurring in third countries whose national insurer's bureaux have joined the green card system whenever such accidents are caused by the use of vehicles insured and normally based in a Member State.
2. Articles 21 and 24 shall apply only in the case of accidents caused by the use of a vehicle:
(a) insured through an establishment in a Member State other than the Sta
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