How to read an Iowa oversize permit

Iowa DOT issues permits online through IAPS (ia.gotpermits.com), which builds your trip and checks it against clearances, bridges and restrictions before the permit is issued. A single-trip permit is for one specific route between an origin and a destination, lasts five days, and covers only Interstate, U.S. and Iowa highways.

How to read the route

Iowa DOT has not published a sample permit, so we can't show where the route prints. In IAPS the trip runs from a start to an end that can be an address, an intersection or exit, or a state border, written like 'US 69 & Garfield Ave' or 'I-80 & Nebraska border'. After the trip is analyzed, the system gives a Trip Description and Trip Length. Iowa DOT says travel restrictions found on the route, like a rush-hour ban in one area, 'will also be output on the permit document.' If the applicant overrode the trip, the route may be a typed text description instead.

Road names on Iowa permits

On the permit	Means
I-80	Interstate 80
I-235	Interstate 235. Iowa DOT's example writes a via point as 'I-80 at I-235'.
US 69 & Garfield Ave	The intersection of U.S. Highway 69 and Garfield Avenue, written as a start or end point
I-80 & Nebraska border	Where I-80 crosses the Nebraska state line

Where the route starts and ends

Iowa DOT's trip page says the origin and destination can be an address, a specific intersection or exit, or a state border. If both ends of the trip are outside Iowa, the original origin and destination are added on the application page.

Conditions to watch for

Travel time

Move from half an hour before sunrise to half an hour after sunset, unless the load qualifies for night travel or the permit sets other hours. Movement is allowed seven days a week, apart from the holiday restrictions. Source

“Movement will be permitted only during the hours from one-half hour before sunrise to one-half hour after sunset”

Night travel

Loads up to 12 feet wide, 14'6" high, 100 feet long and legal axle weights may travel at night. The road must be at least 22 feet wide with 11-foot lanes, and you need red lamps at the rear corners and amber lamps at the front corners of the load. Source

“Travel occurs on roadways with a minimum width of 22 feet and minimum lane width of 11 feet.”

Holidays

No movement on Memorial Day, Independence Day or Labor Day, or after noon the day before. When the holiday falls Friday through Monday, movement stops at noon on the day before the holiday weekend and stays stopped through the weekend. Movement resumes half an hour before sunrise the day after. Source

“A holiday weekend occurs when the holiday falls on Friday, Saturday, Sunday or Monday.”

Weather

Move only when the roads are clear of ice and snow and you can see at least a quarter mile. Source

“Movement shall be made only when roads are clear of ice and snow and visibility is at least one-quarter mile.”

Escorts

Width over 12' up to 18': rear escort on 4-lane roads and front escort on 2-lane roads. Up to 14'6" wide, amber lights on the truck and the rear of the load can replace either escort; over 14'6" up to 16'6", only the 4-lane rear escort. Length over 120 feet: a rear escort. Height over 14'6" up to 20 feet: a front escort with a height pole that measures every clearance. Source

“A pole used for measuring vertical clearances is mounted on the front escorting vehicle.”

Signs, flags and lights

Wide loads (over 8'6") and loads over 75 feet long show an 'Oversize Load' sign at least 18 inches by 7 feet, black on yellow, on the front bumper and the rear of the load. Use red or orange fluorescent flags at least 18 inches square on the corners. When lights are required, as for loads over 85 up to 120 feet long, mount a flashing or strobe amber light on the truck, visible from front and rear. Take them down or cover them when you're back to legal size. Source

“The flags, lights and signs are removed or covered when the vehicle is within legal dimensions.”

Easy to miss

Iowa DOT permits cover state and Interstate highways only. City and county roads need separate permits from those local offices.
The night-travel width limit changed. The current rule (effective September 2025) allows 12 feet, but Iowa DOT's July 2025–July 2026 Truck Information Guide still says 11 feet. Go by what your permit says.
A route can pass analysis and still carry restrictions, like no travel through an area at rush hour. Iowa DOT prints these on the permit, so read them before you roll.

Questions

What are the oversize travel hours in Iowa?

Half an hour before sunrise to half an hour after sunset, seven days a week, apart from holiday restrictions. Loads up to 12 feet wide, 14'6" high and 100 feet long at legal axle weights may also travel at night on wide enough roads with the required lamps.

Which holidays can't oversize loads move in Iowa?

Memorial Day, Independence Day and Labor Day. Movement also stops after noon the day before, and through the whole weekend when the holiday falls Friday through Monday. It resumes half an hour before sunrise the day after.

When do I need an escort for a wide load in Iowa?

Over 12 feet wide: a rear escort on 4-lane roads and a front escort on 2-lane roads. Up to 14'6" wide, amber lights on the truck and the rear of the load can replace the escort. Iowa DOT can require more escorts on any permit.

Sources

Your permit is the legal document; follow everything it says. Rules change; check Iowa DOT's site before you move.Last checked October 2026.