RSA 266:48-a: Tire Tread Depth; Measurement Requirements.

I. No person shall drive a motor vehicle upon any way unless each tire mounted thereon has a minimum tread depth of not less than 2/32 of an inch.

II. Notwithstanding any other provision of law to the contrary, this section shall not apply to:

(a) Commercial motor vehicles, as defined in RSA 259:12-e, that exceed 10,000 pounds in weight.

(b) School buses, as defined in RSA 259:96, that exceed 10,000 pounds in weight.

(c) Mixed use school buses, as defined in RSA 259:96-a, that exceed 10,000 pounds in weight.