Idaho rules
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You can ride an off road vehicle on the street if you meet certain requirements. You must have a valid restricted vehicle license plate, IDPR OHV certificate of number sticker, driver's license, liability insurance or alternative insurance, a helmet (if under 18) and a muffler and U.S. Forest Service-approved spark arrestor.

you may not operate an ATV or UTV on any state or federal highways. Additionally, you should be aware that some roads are closed to OHV use seasonally.

No mention of horn, or turn signals. Riding used to be allowed on state hiways within a certain distance of a town. That may be changed.

Local farmers ride them where ever they feel the need to go. I ride my Suzuki Vinson 500 to the school and back occasionally for grand kids' athletic events.

Some of our hunting units have specific prohibitions against hunting from an ATV. They are okay for packing camp, or meat, but not for spotting game.

People who choose to brew up their own storms bitch loudest about the rain.