What does dot stand for on motorcycle helmets?

DOT stands for the Department of Transportation, which is a federal government agency responsible for regulating and promoting safety standards in various transportation industries, including motorcycles. Motorcycle helmets that are DOT-approved meet certain safety standards set by the Department of Transportation to ensure that they provide adequate protection to riders in the event of an accident or collision. DOT-approved helmets are typically labeled with a DOT sticker or marking to indicate their compliance with these safety standards.