No
In UK at least a full B1 you cannot ride a quad on a motorbike licence.you just need a full UK drivers license to drive a quad (if your in the UK), you also don't need to wear a helmet as its not a legal issue :D
Yes. It is covered by state helmet laws.
It is legal to wear a crash helmet while driving a car.
In most states you need to wear a helmet for quad bikes. Even if it is not a law, when the conditions exist for brain injury, wearing a helmet is always a good idea.
The laws on this vary by jurisdiction.
It is recommended that you wear a helmet, but it is not a legal requirement
Never in CA. It is the law that a helmet is worn at all times.
yes. only if you wear a helmet over them
Yes it is now a road rule
you have to wear a helmet whenever you ride a bike or you will be fined
Off road there is no law governing the use of a helmet, however, you would be foolish not to want to wear a good quality helmet. Your helmet is the number 1 piece of protective equipment you will own/wear.
No single answer to that, the laws can be different from one state to another.