Sec. 545.365. SPEED LIMIT EXCEPTION FOR EMERGENCIES; MUNICIPAL REGULATION. (a) The regulation of the speed of a vehicle under this subchapter does not apply to: (1) an authorized emergency vehicle responding to a call; (2) a police patrol; or (3) a physician or ambulance responding to an emergency call. (b) A municipality by ordinance may regulate the speed of: (1) an ambulance; (2) an emergency medical services vehicle; or (3) an authorized vehicle operated by a blood or tissue bank. Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995. SUBCHAPTER I. MISCELLANEOUS RULES