Iowa State Regulations
Transportation Restrictions
Travel restricted during the following holidays: Memorial Day, Independence Day, and Labor Day. No movement will be allowed on these holidays or after noon on days preceding these holidays and holiday weekends which include holidays that fall on Monday.
Operating Time
Half an hour before sunrise to half an hour after sunset.
Weekend Travel
Travel allowed on Saturday and Sunday.
Night Moves
Night travel may be permitted if under 100′ Long, 11′ Wide, or 14’4″ High.
Transportation Requirements
Provision Regulations
Superloads
Anything over routine issue dimensions requires special review from the DOT.
Oversize Load Signs
“Oversize Load” signs required if over 75’ long, 8’6” wide, or 14’4” high.
Flags/Lights
A revolving amber light is required when length exceeds 85’ or front overhang exceeds 25’ or rear overhand exceeds 10’ or weight exceeds 80,000 lbs. An escort can be used in lieu of an amber light
18” red flags are required on the extremities of any overwidth load, for any load over 75’ long, or 14’4” high, and for any rear projection that exceeds 4’.
Legal Limits
| Component | Restriction |
|---|---|
| Single Axle | 20,000 lbs. with Pneumatic Tires, 14,000 lbs. with Solid Rubber Tires |
| Tandem Group | 34,000 lbs. |
| Tridem Group | 42,000 lbs. |
| Gross Weight | 80,000 lbs. |
| Width | 8’6″ |
| Height | 13’6″ |
| Length – Semi-Trailer | 53′ |
| Length | 70′ |
| Length | 3′ Front | 4′ Rear – Cannot exceed 53′ Semi-Trailer/Load/Overhang |
Routine Issues
| Component | Restriction |
|---|---|
| Single Axle | 20,000 lbs. |
| Tandem Group | 40,000 lbs. |
| Tridem Group | 60,000 lbs. |
| Quad Group | 80,000 lbs. |
| Gross Weight | 100,000 lbs. |
| Width | 14′ |
| Height | Must Clear Heights on Route |
| Length | 120′ |
Escort Requirements
| Dimension | Requirement |
|---|---|
| When Width exceeds Half the Road up to 14’6″ | 1 Front on 2-Lanes* |
| Width Over 14’6″ | 1 Front on 2-Lanes |
| Width up to 16’6″ If over Half the Road | 1 Rear on 4-Lanes |
| Width Over 16’6″ | 1 Rear on 4-Lanes |
| Height Over 14’4″ | 1 Front with High Pole |
| Length Over 120′ | 1 Rear |
*When road width is 12’ or more with sufficient shoulders, of 6’ in width, amber lights on the front and rear of the vehicle and load may be used in place of the front escort.