(a) Safety.
(b) The efficiency of emergency response operations.
(c) The requirements for traffic signal maintenance.
(d) The efficiency of public transit operations.
(e) Traffic flow.
(2) The Department of Transportation shall adopt rules establishing priorities and preemptive use among users of traffic control signal operating devices. The rules shall take into account:
(a) Local standards for response times to emergencies by emergency service providers; and
(b) The weight, operating speed and braking distance required for vehicles operated by all authorized users. [1997 c.507 §5]