No person shall operate a snow vehicle or a recreation vehicle as those terms are defined in M.G.L. c. 90B, § 20 on any public way, street, alley or path within Devens or any part of the Devens Properties. In the event of a determination by the Executive Director of the Agency, that because of emergency conditions, public ways within Devens are rendered impassable to conventional motor vehicles, the Executive Director may authorize the officer in charge of the Police to grant permits to civil defense volunteers to operate snow vehicles on such ways for such purposes as may be necessary to ensure the health and safety of the public. Such permits shall be rescinded promptly upon the abatement of such emergency conditions.
946 CMR, § 4.11