It shall be the duty of officers designated by the Chief of Police to enforce the provisions of these rules and regulations. Such officers are hereby authorized to direct all traffic, either in person or by means of visible or audible signal, in conformance with the provisions of these rules and regulations, provided that, in the event of a fire or other emergency and in order to expedite traffic or safeguard pedestrians, officers of the Police or Fire Department may direct traffic as conditions may require, notwithstanding the provisions of these rules and regulations.
The Chief of Police is hereby authorized to temporarily close any street or highway in an impending or existing emergency, or for any lawful assemblage, demonstration or procession.
The Chief of Police is hereby authorized to temporarily prohibit parking on any street or highway or part thereof in an impending or existing emergency or for a lawful assemblage, demonstration or procession. Vehicles parked in places where parking is temporarily prohibited may be moved by or under the direction of an officer.
The Chief of Police is hereby authorized to appoint an officer of the Police Department to be the Safety Officer. The duties of the Safety Officer are as follows. The Safety Officer shall:
A. 
Investigate vehicle accidents.
B. 
Recommend improvements to the streets and highways in order to reduce the frequency of accidents.
C. 
Investigate the requests of residents for the posting of warning and regulatory signs.
D. 
Prepare requests to the Board, where applicable, for the installation of warning and regulatory signs where the Board of Selectmen has jurisdiction.
E. 
Prepare requests to the Board, where applicable, where the Board must request a permit from the Massachusetts Department of Public Works to install a warning or regulatory sign.
F. 
Act in an advisory capacity to the Traffic Advisory Committee.
The provisions of these rules and regulations shall not apply to drivers actually engaged in work upon a street or highway closed to travel or under construction or repair, to officers when engaged in the performance of public duties or to drivers of emergency vehicles while operating in an emergency and in performance of public duties when the nature of the work of any of these necessitate a departure from any part of these rules and regulations. These exemptions shall not, however, protect the driver of any vehicle from the consequences of a reckless disregard of the safety of others.