DVLA warning 
  In order to assist other motorists to 
 identify potentially dangerous drivers, it's 
 now compulsory for anyone with a lower than 
 average IQ and driving ability to display a 
 warning flag. 
 
 The flag (comprising a red cross on a white 
 background) must be attached to the top of at 
 least one door of their vehicle. 
 
 For drivers of exceptionally low mental 
 ability, additional flags are required. 
 
 *** Warning ends ****