As a general rule, is it mandatory to carry the International Insurance Certificate (Green Card) when driving a Spanish vehicle through countries of the European Union?
A)Yes, it is mandatory in all countries outside of Spain.
B)No, because standard Spanish compulsory insurance automatically guarantees coverage within the EU.Correct
C)Yes, but only if you plan to stay in that country for more than 30 days.
Under DGT regulations, any vehicle insured in Spain carries automatic third-party liability coverage across the entire European Economic Area (plus the UK, Switzerland, and Andorra). Therefore, carrying the physical or digital Green Card is entirely unnecessary when traveling within the EU.