1. In the case of an accident caused by a set of vehicles consisting of a vehicle towing a trailer, where the trailer has a separate third party liability insurance, the injured party may bring his or her claim directly against the insurance undertaking that insured the trailer, where:
(a) the trailer can be identified, but the vehicle that towed it cannot be identified; and
(b) the applicable national law provides for the insurer of the trailer to provide compensation.
An insurance undertaking that has compensated the injured party shall have recourse to the undertaking that insured the towing vehicle, or to the body referred to in Article 10(1), if and to the extent that this is provided for under the applicable national law.
This paragraph shall be without prejudice to applicable national law providing for rules more favourable to the injured party.
2. In the case of an accident caused by a set of vehicles consisting of a vehicle towing a trailer, the insurer of the trailer, unless
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