Ifølge Wikipedia er det "lokalt udstedte" plader, som kun skal (og kun må) køre indenfor det pågældende område (jeg formoder a la amter eller kommuner):
"Yellow background plates are issued by the local authorities such as town hall, municipalities, village or commune mayoralties for the registration of certain light vehicles, or other types of vehicles that do not need country-wide authorization, such as public utility vehicles, some light garbage trucks, lawn mowers, small sanitation vehicles, mass-transit vehicles tethered to local infrastructure, quad bikes, scooters, golf carts and non-road going agricultural vehicles, such as combine harvesters, non-road-going tractors, or horse-drawn carts.
[...]
Vehicles bearing yellow plates may not leave the jurisdiction of the authority that issued the plate, but some of them can cross county borders on occasion, for example rental scooters, vehicles being towed, or trolleybuses on their way from the factory to the depot. In the case of rental vehicles such as scooters or quad bikes, they tend to retain the registration plates issued by the authority of the region where the owner resides even when they are used in another jurisdiction"
https://en.wikipedia.org/wiki/Vehicle_r ... ion_platesMed andre ord, er det altså en temmelig normal nummerplade i Rumænien, men jeg kan ikke umiddelbart komme på nogen nordisk eller tysk pladetype, som minder om dem, eller som på anden måde er geografisk begrænset, ligesom de gule rumænske plader.