6-3-6: COMPLIANCE:
No driver of a vehicle shall disobey the instructions of any official traffic control device placed in accordance with the provisions of this chapter, unless at the time otherwise directed by a police officer, subject to the exceptions granted the driver of an authorized emergency vehicle under section 321.231 of the code of Iowa. (2000 Code § 61.06)
   (Code of Iowa, Sec. 321.256)