What you are describing is an electric scooter and no need to change the current regulations. City streets in the United States will never be safe for cyclists as they are designed to give first priority to motor vehicles and then second priority to providing subsidized parking for motor vehicles.
This is reflected in city and transportation planning over the past 75 years with GM, Firestone Tire, and Standard Oil conspiring and successfully buying all the eletric street car lines in the country and then ripping out the rails and burning all the trolley cars. Vastly different in Europe where the governments do the planning and not capitalist corporations. In the USA corportations can steal and murder with complete impunity and they even get to vote with their funding of politicians and governement agencies. As per the golden rule, those with the gold make the rules.