§ 2 para 3 sentence 1 Highway Code is as follows:

"Driving on ice, packed snow, slush, ice or hoarfrost may a vehicle be driven with tires, which set out in Annex II, section 2.2 of Council Directive 92/23/EEC of 31 March 1992 on the tires of motor vehicles and their trailers and to their fitting (OJ L 129, 14.5.1992, p. 95), which was last amended by Directive 2005/11/EC (OJ L 46, 17.2.2005, p. 42), satisfy the properties described (M + S tires). "

In order to apply the clear wording of the provision, the duty at such weather conditions only with M + S tires to drive, for all motor vehicles.

As a motor vehicle, all road vehicles, which are moved by mechanical power, without being tied to railroad tracks (* 1 Section 2 Road Traffic Act). This undoubtedly includes quads.

As M + S tires are all the tires that meet the requirements outlined in Directive 92/23/EEC properties (M + S tires). thereafter,

M + S tires tires where the tread pattern and structure

are designed so that they provide, especially in mud and fresh or melting snow, a better ride than normal tires. The profile of the tread of the M + S tires is generally characterized by larger grooves and / or galleries, which are separated by large gaps, as this is the case with normal tires. Whether a tire is an M + S tires depends, not on the specific identification of the tires. Comply with the tires because of their rough tread profile is obviously the described properties, a corresponding M + S marking not required.

I hope I could help you with this information to some enlightenment.