Do y’all think it would be a good idea to have the law changed to specifically define quadricycles as bicycles so that they can be legally ridden like any other bicycle?
I assume you are referring to human powered quads. You are correct that a quad is not a bicycle since it has four wheels.
s. 316.003 – Definitions
(4) Bicycle – Every vehicle propelled solely by human power …. having two tandem wheels, and including any device generally recognized as a bicycle though equipped with two front or two rear wheels. ….
However, that does not limit the operation of such a vehicle on the roads, since the rights and duties are not just for the operator of a bicycle, but for the operator of any human powered vehicle.
s. 316.2065 – Bicycle Regulations
(1) Every person propelling a vehicle by human power has all of the rights and all of the duties applicable to the driver of any other vehicle ….
The fact that it is a human powered vehicle allows operation on a sidewalk.
(9) A person propelling a vehicle by human power upon and along a sidewalk, or across a roadway upon and along a crosswalk, has all the rights and duties applicable to a pedestrian under the same circumstances.
s. 316.1995 – Driving upon Sidewalk or Bicycle Path
(1) ….. a person may not drive any vehicle other than by human power upon a bicycle path, sidewalk, or sidewalk area ….
The only time a motorized bicycle is allowed on a sidewalk or bike path is when there is a local ordinance permitting it.
The primary circumstance that would make the vehicle different from a bicycle regarding rights and duties would be adding an electric assist motor, which is legal for a motorized bicycle but not for a motorized quad vehicle, since the quad vehicle has four wheels and is not a bicycle.
Continuing from the Definitions, above,
…. and every motorized bicycle propelled by a combination of human power and an electric helper motor capable of propelling the vehicle at a speed of not more than 20 miles per hour on level ground upon which any person may ride ….
A motorized quad would be considered a motor vehicle and must meet all the requirements for such a vehicle.
Another circumstance affecting the rights and duties might be a local ordinance prohibiting the operation of bicycles on sidewalks.
s. 316.008 – Powers of Local Authorities
(h) Regulating the operation of bicycles.
It would not apply to the quad unless so specified in the ordinance.
A change to the laws is not required. A human powered quad can be operated just like a human powered bicycle.