There is good reason to consider government regulation as the minimum requirement. After 40 plus years in the transportation business I am seriously contemplating fitting inertial reel lap belts on my collection of two wheeled machines capable of 20 mph or more. Any fairing I build has crash conditions in mind. Much updating of state laws needs to be done to address enclosed three wheel vehicles. If the roll cage can support three times the maximum vehicle weight then a helmet may not be needed when a three or more point harness is used.
For an enclosed electric motorcycle the price of $15,000 USD would be competitive. Don't expect much in the way of heat or AC.
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