PART I. ADMINISTRATION OF THE GOVERNMENT
TITLE XIV. PUBLIC WAYS AND WORKS CHAPTER
89. LAW OF THE ROAD
Chapter 89: Section 3. Sleigh or sled; bells

Section 3. No person shall travel on a way with a sleigh or sled drawn by a horse, unless there are at least three bells attached to some part of the harness.

M.G.L. - Chapter 89, Section 3