It means something has been approved by the Department of Transportation.
"Dot" is "DOT" - Department of Transportation. So DOT Approved means "Approved by the Department of Transportation".
Department Of Transportation has approved
By dot helmet do you mean a Department of Transportation approved type ?
means that dot has not approved this tank to drive
What does DOT and SAE approved means
No.
In most states DOT helmets are required.
Is illegal
All helmets must be DOT approved and have the DOT sticker on them, in the US, when helmets are required.
No. As they're not intended for use with ground vehicles (such as motorcycles), they're not even evaluated by the DOT.
No, it needs to be DOT (Department of Transportation) approved.
go to a DOT office and figure out what technical colleges are approved and how to register for the class