Multiple cards will also be required if motorists are using multi-car or fleet insurance policies.
Car insurance green cards are free once drivers apply through their providers meaning motorists should not pay any extra charges to travel abroad.
Experts at insurance firm Admiral said all drivers can be listed on green cards as long as your licence allows you to travel abroad.
Policyholders and named drivers who only hold a provisional licence will not appear on the green card and cannot drive the vehicle abroad.
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Which? has also issued a warning to road users who may rely on the European Health Insurance Card (EHIC) to travel.