https://www.atv.com/utvs/what-is-a-utv
For reference, a UTV is not a dirt bike.
Even the web page you linked states:
Additionally, none of the
vehicle categories found in the Iowa Motor Vehicle Code can be used to register a UTV for street legal use. Of the possible candidates:
- Autocycles are required to have three wheels
- Motorcycles cannot have more than three wheels
- Low-Speed Vehicles must meet federal LSV qualifications including a top speed of 25 MPH
Photograph of a UTV: