Mass. Gen. Laws ch. 266 § 121A
Whoever, without right, enters upon the private land of another, whether or not such land be posted against trespass, and in so entering makes use of or has in his immediate possession or control any vehicle, machine, or device which includes an internal combustion engine or other source of mechanical power, shall be punished by a fine of not more than $500.
The provisions of this section shall not apply to such an entry at the junction of a public way with a paved private roadway, unless said private roadway is distinguished from the public way by a sign, gatepost, or the display of a street number or the name of the occupant of the premises, or by the improvement of adjacent land, the type of construction of the roadway, or other distinguishing feature, or unless such entry has been forbidden by the person having lawful control of said private roadway.
Nothing herein shall in any way restrict the operation of power boats on waterways not otherwise restricted.
Mass. Gen. Laws ch. 266, § 121A