Are 4D Gel Number Plates Road Legal? At Aplates, we are regularly asked, ‘Are 4D Gel number plates road legal?’. So, to put it simply, the answer is YES. As a DVLA-registered manufacturer and supplier of number plates, we have to ensure all of our plates meet the British Standard. 4D Reg Plates The current British Standard for UK number plates is the BS AU 145e. This became...