The Green Card System is a United Nations system overseen by the Economic Commission for Europe based in Geneva. The purpose of the system is to facilitate the free movement of vehicles over borders and to protect the interests of the victims of foreign registered vehicles.

The Green Card is a document which is recognized in over 40 countries including all the countries of Europe with the exception of Russia. However a Green Card cannot be obtained for Iraq as this country is no longer a member of the Green Card System. The Green Card offers no insurance cover but is proof that the minimum legal requirements for third party liability insurance in any country for which the Green Card is valid are covered by the insured's own motor policy.