§ 2335-a. Prohibition of rate increases for persons involved in emergency use of vehicles. No insurer authorized to transact or transacting business in this state, or controlling or controlled by or under common control by or with an insurer authorized to transact or transacting business in this state, which sells a policy providing motor vehicle liability insurance coverage in this state shall increase the policy premium in connection with the insurance permitted or required by this chapter solely because the insured or any other person who customarily operates an automobile covered by the policy has had an accident while operating a motor vehicle in response to an emergency, where the insured was either responding to a call to duty as a paid or volunteer member of any police or fire department or first aid squad; or was performing any other function on behalf of the state, any political subdivision thereof, a public authority, public benefit corporation, or any other governmental agency or instrumentality in a public emergency.