Relating to all-terrain vehicles; prescribing an effective date.

HB 3678 expands all-terrain vehicle (ATV) access by allowing county governments to designate ATV routes on county roads, not just state highways. This directly affects counties (which gain authority to create routes), ATV users (who gain new access), and local communities (which must consult through a new advisory committee). The bill creates an advisory committee to review route proposals, consider factors like safety and landowner impacts, and hold public meetings before recommendations are made. It amends Oregon law to require county route designations to follow the same process as state highway routes. The bill takes effect 91 days after the legislative session ends.