valid and current road tax exemption certificate gen.

[Andrew-Translator]

You and your visitors must not:

Park or allow to be parked off road on the private land forming part of your property any vehicle that is not taxed (with the exception of a vehicle for which a valid and current road tax exemption certificate has been issued by the statutory body).

Подскажите, пожалуйста, как переводится:
"valid and current road tax exemption certificate"?

"действующий сертификат освобождения от дорожных налогов"?

Спасибо!