Vespa laws, FYI

So my brothers chipped in and gave me a very old Vespa for my graduation present. It has been in the shop since May 18th, but I might possibly be able to get it this week. I've been reading up on Missouri laws for motorized bicycles/scooters (under 50cc engine) and whether I need insurance or a license or what have you.

• No person shall ride a motorized bicycle upon a sidewalk.
• 307.180. Bicycle And Motorized Bicycle, Defined
  As used in sections 307.180 to 307.193: (1) The word bicycle shall mean every vehicle propelled solely by human power upon which any person may ride, having two tandem wheels, or two parallel wheels and one or two forward or rear wheels, all of which are more than fourteen inches in diameter, except scooters and similar devices; (2) The term motorized bicycle shall mean any two or three-wheeled device having an
  automatic transmission and a motor with a cylinder capacity of not more than fifty cubic centimeters, which produces less than three gross brake horsepower, and is capable of propelling the device at a maximum speed of not more than thirty miles per hour on level ground. A motorized bicycle shall be considered a motor vehicle for purposes of any homeowners- or renters- insurance policy.
  

from: Missouri State Statutes Regarding Bicyclists (August 2005)

• it is illegal to operate motorized bicycles on public streets and highways unless the operator has a driver’s license.
• Motorized bicycles and mini-motorcycles that have a motor with a cylinder capacity of more than 50cc and/or the ability to travel faster than 30 mph on level ground are--by law--defined as motorcycles. As such, these types of vehicles must abide by all of the state laws pertaining to motorcycles.

from: Missouri State Highway Patrol News Release, July 30, 2007

• What are the licensing requirements for motor scooters or mopeds (under 50cc)?

  Licensing for a scooter or moped depends on whether the vehicle meets the definition of a motorized bicycle. The Missouri statute definition of a motorized bicycle is as follows:

  "Any two-wheeled or three-wheeled device having an automatic transmission and a motor with a cylinder capacity of not more than fifty (50) cubic centimeters, which produces less than three (3) gross brake horsepower, and is capable of propelling the device at a maximum speed of not more than thirty (30) miles per hour on level ground."

  A motorized bicycle does not have to be registered with the Missouri Department of Revenue. However, you must have a valid driver license to operate a motorized bicycle (though no motorcycle endorsement is required).

  Missouri statute does not require a helmet to be worn when operating a motorized bicycle. Please contact your local law enforcement agencies for any county/municipal codes that deal with helmets and motorized bicycles.

  Keep in mind that no motorized bicycle may be operated on any public thoroughfare located within this state that has been designated as part of the federal interstate highway system.

From: Missouri Department of Revenue