Adult electrical city bike refer to two-wheeled bicycles that comply with relevant national technical standards, use on-board batteries as auxiliary energy, have pedal riding ability, and can realize electric assist or electric drive functions. An adult driving an adult electrical city bike can carry a minor under the age of sixteen, and a fixed safety seat must be installed for a minor under the age of six. Drivers and passengers should wear safety helmets that comply with relevant national standards, and drive electric bike on the road with a driving license. The state encourages sellers to carry out sales with safety helmets.It is prohibited to sell electric bike that do not meet the currently valid national standards, have no legal origin, are assembled, retrofitted or modified.