321.256  Obedience to official traffic-control devices.
  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 peace officer subject to the exceptions granted the driver of an authorized emergency vehicle.
[C39, §5019.05; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.256]
Referred to in §321.482A, 321E.17, 805.8A(8)(b)
For applicable scheduled fine, see §805.8A, subsection 8 
Additional penalties for violations causing serious injury or death, see §321.482A