(1) it's a violation of this statute for anyone to:

(a) operate a Class I ATV, Class II ATV, Class III ATV or Class IV ATV on premises open to the public or on a highway and the person carries another person on ATV who is under 18 & isn't wearing a motorcycle helmet with a fastened chin strap OR

(b) the person is the parent, legal guardian or person with legal responsibility for the safety and welfare of a child under 18 and the child operates or rides on a Class I ATV, Class II ATV, Class III ATV or Class IV ATV on premises open to the public or on a highway without wearing a motorcycle helmet with a fastened chin strap

(2) the requirement to wear a motorcycle helmet with a fastened chin strap doesn't apply if the ATV is:

(a) used exclusively in farming, agricultural or forestry operations or used by persons licensed under ORS chapter 571 exclusively for nursery or Christmas tree growing operations.

(b) being used on land owned or leased by the owner of the vehicle.

(c) a Class II ATV registered under 803.420 (Registration fees) and has a roof or roll bar.