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The DVLA aren't so sure:
The agency has not seen any evidence to show that number plates
displaying raised plastic, acrylic or Perspex lettering (3D/4D plates)
are able to meet the requirements of either the current or new the
British Standard.https://content.govdelivery.com/accounts/UKDVLA/bulletins/2af0fc9
In Surrey at least the police would seem to unimpressed
https://twitter.com/SurreyRoadCops/status/1480949665608650753
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Sure.
I'm all for anything that encourages people to buy safer and more fuel efficient cars, as long as it's evidence based.
You hear SUV weight coming up a lot. Heavier cars have worse outcome in accidents....that much we know for sure. Loads of overlap between car classes though. Passats are heavier than most of VW groups mid size SUVs for example. Do it partly based on weight and NCAP ratings rather than category.
Many 4D number plates are perfectly legal.
https://www.carbuyer.co.uk/tips-and-advice/303812/3d-and-4d-number-plates-are-they-legal-and-whats-the-difference