321E.34  Escort requirements.
  1.  An operator of an escort vehicle, serving as an escort in the movement of vehicles and loads of excess size and weight under permits required by this chapter shall have a driver’s license as defined in section 321.1 valid for the operation of the escort vehicle.
  2.  Vehicles under permit, the width of which, including any load, exceeds that prescribed in section 321.454 but does not exceed fourteen feet six inches including appurtenances, may be moved on two-lane highways of this state without an escort if the highway being traversed has a minimum lane width of twelve feet and a sufficient shoulder width and if an amber revolving light or strobe light is displayed on the power unit and on the rear extremity of the vehicle or load. In addition, vehicles moving under permit, including any load, with an overall width not exceeding sixteen feet six inches may be moved on an interstate or four-lane highway of this state without an escort if an amber revolving light or strobe light is displayed on the power unit and on the rear extremity of the vehicle or load.
  3.  The department shall adopt rules pursuant to chapter 17A for all escort requirements other than those exempted in subsection 2. The rules shall include escorting requirements for annual permits, single-trip permits, multi-trip permits, special or emergency situations, length, height, and weight.
97 Acts, ch 104, §29; 98 Acts, ch 1073, §9