@AnTyx
When someone buys a vehicle in another country and want to bring it to his country of residence he has to registrate the vehicle and get local numberplates in the country of residence. It varies by country when it must be done.
Registrating a vehicle is very expensive, you have to pay vehicle-related taxes. Also in between EU countries.
With open borders it is not possible to know when the vehicle came into the country of residence. Most people don´t want to pay all that money so they could lie about when the vehicle came into the country and say ¨I will registrate it ¨ but don´t do it.
Therefore in many countries residents are not allowed to drive a foreign registrated car. I think a rental car could be an exception because you then have the rental agreement to prove it is not your car.
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