321.333  Duty of drivers.
  Any driver of a vehicle or operator of a motor-driven vehicle who approaches or comes in contact with a person wholly or partially blind carrying a cane or walking stick white in color or white tipped with red, or being led by a guide dog wearing a harness and walking on either side of or slightly in front of said blind person, shall immediately come to a complete stop, and take such precautions as may be necessary to avoid accident or injury to the person carrying a cane or walking stick white in color or white tipped with red or being led by a guide dog.
[C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.333]
For applicable scheduled fine, see §805.8A, subsection 7 
Additional penalties for violations causing serious injury or death, see §321.482A