Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 143, § 71N

(1) whenever maintenance or snow-making equipment is being employed on any ski slope or trail open to the public, conspicuously place or cause to be placed, notice at or near the top of any ski slope or trail being maintained that such equipment is being so employed, and shall conspicuously indicate the location of any such equipment in a manner to afford skiers reasonable notice of the proximity of such equipment;

(2) mark and identify all trail maintenance and emergency vehicles, including snowmobiles, and furnish such vehicles with flashing or rotating lights, which shall be operated during the time that said vehicles are in operation within the ski area;

(3) with respect to the emergency use of vehicles within the ski area, including but not limited to uses for purposes of removing injured or stranded skiers, or performing emergency maintenance or repair work to slopes, trails or tramway equipment, not be required to post such signs as is required by clause (1), but shall be required to maintain such lighting equipment required by clause (2);

(4) mark the location of any hydrants used in snow-making operations and located within or upon a slope or trail;

(5) conspicuously place within the ski area, in such form, size and location as the board may require, and on the back of any lift ticket issued notice, in plain language, of the statute of limitations and notice period established in section seventy-one P; and

(6) maintain a sign system on all buildings, recreational tramways, ski trails and slopes in accordance with rules and regulations promulgated by the board and shall be responsible for the maintenance and operation of ski areas under its control in a reasonably safe condition or manner; provided, however, that ski area operators shall not be liable for damages to persons or property, while skiing, which arise out of the risks inherent in the sport of skiing.