SECTION 1.  Section 1A of chapter 90 of the General Laws, as appearing in the 2010 Official Edition, is hereby amended by inserting after the third paragraph the following paragraph:-

A registered motor vehicle, which has been issued a certificate, may be operated off a public way by any person authorized pursuant to sections 8 or 8B.  The operation of such registered motor vehicle shall not be considered a recreation vehicle or off-highway vehicle for the purposes of chapter 90B.

SECTION 2.  Section 20 of chapter 90B of the General Laws, as so appearing, is hereby amended by striking out the definition of “Recreation vehicle” and inserting in place thereof the following definition:-

“Recreation vehicle” or “off-highway vehicle”, any motor vehicle designed or modified for use over unimproved terrain for recreation or pleasure while not being operated on a public way as defined in chapter 90 including, but not limited to, all-terrain vehicles, off-highway motorcycles, dirt bikes, recreation utility vehicles; provided, however, that recreation vehicles and off-highway vehicles operated exclusively for agricultural, forestry, lumbering or construction purposes shall not be subject to this chapter and it shall be an affirmative defense that such vehicle was being operated for such purposes at the time of an alleged violation of this chapter.