321.453  Exceptions.
  The provisions of this chapter governing size, weight, and load, and the permit requirements of chapter 321E do not apply to fire apparatus; road maintenance equipment owned by, under lease to, or used in the performance of a contract with any state or local authority; or to implements of husbandry moved or moving upon a highway, except for those implements of husbandry moved or moving on any portion of the interstate and except as provided in sections 321.463, 321.471, and 321.474. A vehicle, carrying an implement of husbandry, which is exempted from the permit requirements under this section shall be equipped with an amber flashing light visible from the rear. If the amber flashing light is obstructed by the loaded implement, the loaded implement shall also be equipped with and display an amber flashing light. The vehicle shall also be equipped with warning flags on that portion of the vehicle which protrudes into oncoming traffic, and shall only operate from thirty minutes prior to sunrise to thirty minutes following sunset.
[C39, §5035.02; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.453; 82 Acts, ch 1154, §3, ch 1254, §3]
86 Acts, ch 1210, §6; 87 Acts, ch 186, §4; 94 Acts, ch 1087, §3; 94 Acts, ch 1198, §45; 98 Acts, ch 1003, §1; 98 Acts, ch 1223, §26; 99 Acts, ch 13, §18; 99 Acts, ch 108, §6