Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321E.11. Movement under permit--penalty

1. Movements under permit in accordance with this chapter shall be permitted only during the hours from thirty minutes prior to sunrise to thirty minutes following sunset unless the permit-issuing authority determines that the movement can be better accomplished at another period of time because of traffic volume or other roadway-related conditions or the vehicle subject to the permit qualifies for nighttime movement as specified in subsection 2.

2. A permitted vehicle which has an overall length not to exceed one hundred feet an overall width not to exceed eleven feet, and an overall height not to exceed fourteen feet, six inches, may operate under permit from thirty minutes following sunset to thirty minutes prior to sunrise on primary and nonprimary highway system roadways that are at least twenty-two feet in total width with at least eleven feet of lane width. Vehicles operating under the provisions of this subsection shall be equipped with operating projecting-load lighting devices which are in addition to the required vehicle lighting and the signs, flags, and warning lights required for vehicles operating under permit. Additional safety lighting and escorts may be required for movement at night as determined by the permit-issuing authority.

3. Except as provided in section 321.457, no movement under permit shall be permitted on holidays, after 12:00 noon on days preceding holidays and holiday weekends, or special events when abnormally high traffic volumes can be expected. Such restrictions shall not be applicable to urban transit systems as defined in section 324A.1.

4. For the purposes of this chapter, “holidays” shall include Memorial Day, Independence Day, and Labor Day.

5. A person who violates this section commits a simple misdemeanor.