321.316  Stopping.
  No person shall stop or suddenly decrease the speed of a vehicle without first giving an appropriate signal in the manner provided herein to the driver of any vehicle immediately to the rear when there is opportunity to give such signal.
[S13, §1571-m18; C24, 27, 31, 35, §5032; C39, §5025.06; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.316]
Referred to in §805.8A(6)(p)
For applicable scheduled fine, see §805.8A, subsection 6