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Iowa DOT Regulations for Oversize/Overweight Load Flags/Banners/Signs/Lights, Running Hours and Holiday Restrictions

For All State Regulations, See:

Iowa Oversize / Overweight Regulations

Running Hours and Holiday Restrictions

Movement permitted from 1/2 hr. before sunrise to 1/2 hr. after sunset, 7 days a week except for designated holidays and for special events when abnormally high traffic counts can be expected. The designated holidays are Memorial Day, Independence Day, and Labor Day. No movement will be allowed on these holidays or after 12 noon on days preceding these holidays and holiday weekends that include holidays falling on Monday, except as provided for in Iowa Code 321.457. 24-hr continuous movement permitted for vehicles with dimensions that do not exceed: Width 11', height 14' 6'Length 100', and weight within legal limits.

"Oversized Load" Banner Regulations and Requirements

For all oversize loads, an “Oversize Load" sign must be used. Size: Length - 7", height 18" Letters: Black, 10" (min), 1.5" stroke Background: Yellow

Flag Requirements

Red or orange fluorescent flags at least 18ʺ square, must be mounted at each front corner of the towing unit and at each rear corner of the load. There must be a flag at any protrusion in the width of the load.

Warning Lights: Color and Placement

A flashing or strobe amber must be mounted on the towing unit. For Continuous moves, safety lighting required at the extrimeties of the load and positioned at both the extreme front and rear of the vehicle or trailer as follows: lighted amber lights at the forward corners, lighted red lights if the rear . A vehicle over 12' up to and including a width of 16' 6 may use an amber or strobe light on the cab of the power unit and on the rear extremity of the vehicle or load.

Source of Information:


What is considered as "Oversized Load" in Iowa?

Dimensions: Width: 8' 6" Height: 13' 6"' Length Overall : Single Vehicle 41' Trailer 53' Trailer 57' Lowboy Legal Overhang: Front 4', Rear

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