This may not mean a lot to members not from the the UK
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Newsflash from DVLA
In order to assist other motorists in identifying potentially dangerous drivers, it's now compulsory for anyone with a lower than average IQ and poor driving ability to display a warning flag.
The flag (comprising of a red cross on a white background) will be attached to the top of at least one door of their vehicle.
For drivers of exceptionally low ability, additional flags are required.