(a) A volunteer fire fighter who operates a private vehicle as an authorized emergency vehicle may engage in conduct permitted by § 546.001 only when the fire fighter is using visual signals meeting the pertinent requirements of Sections 547.305 and 547.702.
(b) An authorized emergency vehicle that is operated as a police vehicle is not required to be equipped with or display a red light visible from the front of the vehicle.

(c) A police officer may operate an authorized emergency vehicle for a law enforcement purpose without using the audible or visual signals required by § 546.003 if the officer is:
(1) responding to an emergency call or pursuing a suspected violator of the law with probable cause to believe that:
(A) knowledge of the presence of the officer will cause the suspect to:
(i) destroy or lose evidence of a suspected felony;
(ii) end a suspected continuing felony before the officer has obtained sufficient evidence to establish grounds for arrest; or
(iii) evade apprehension or identification of the suspect or the suspect’s vehicle; or
(B) because of traffic conditions on a multilaned roadway, vehicles moving in response to the audible or visual signals may:
(i) increase the potential for a collision; or
(ii) unreasonably extend the duration of the pursuit; or
(2) complying with a written regulation relating to the use of audible or visible signals adopted by the local government that employs the officer or by the department.