Tennessee Code Title 55. Motor and Other Vehicles § 55-8-307

(a) It is a delinquent act for a person under fourteen (14) years of age to operate a class 3 electric bicycle upon any street or highway; provided, that the person may ride as a passenger on a class 3 electric bicycle that is designed to accommodate passengers.

(b) The operator and all passengers of a class 3 electric bicycle, regardless of age, shall wear a properly fitted and fastened bicycle helmet meeting federal standards established by the United States consumer product safety commission or the American Society for Testing and Materials. A label on the helmet shall be affixed signifying the helmet complies with this subsection (b).