EXCEPTIONS TO SIGNAL REQUIREMENT.

(a) A volunteer fire fighter who operates a private vehicle as an authorized emergency vehicle may engage in conduct permitted by Section 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 Section 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.