Relating to: operation of all-terrain and utility terrain vehicles, off-highway motorcycles, and snowmobiles and revision of the Department of Transportation highway maintenance manual.

AB 329 clarifies and updates regulations for all-terrain vehicles (ATVs), utility terrain vehicles (UTVs), off-highway motorcycles, and snowmobiles. It creates new definitions for terms like "bridge," "culvert," "dune buggy," and "navigable waterway" to standardize language in traffic laws. Key provisions require ATVs to have one headlamp/tail lamp and UTVs to have two of each, prohibit operation without functioning lights, and specify rules for crossing bridges/culverts (e.g., 1,000 feet or less, with local ordinances). The bill also adds exceptions for emergency use and defines patrol vehicles used by law enforcement. This directly affects ATV/UTV operators, emergency responders, and local governments managing roadway access.