Couple of the answers seem wrong though....
  I don't see how a white helmet would make you more visible in daylight, black stands out much more against a light background
 
  Seems silly to lose a mark for saying min legal tread is 1.6mm not 1mm - which is safer 

 (again) 
 I won't even go into the one about the slow scooter on a narrow windy road 
