(a) Every police, fire department and fire patrol vehicle and every ambulance used for emergency calls, except as provided in subsection (b) of this section, shall be equipped with a bell, siren or exhaust whistle.
(b) A vehicle used by a fire chief, deputy fire chief, assistant fire chief, or fire police officer of a duly organized fire department, which is not owned by or the property of the fire department, shall not be equipped with such warning devices.