Minnesota OSOW permits

Permits valid for five travel days. Must have a permit prior to entering the state.

Minnesota permitting system: https://osowpermits.dot.state.mn.us/rbnet/

Contact phone number: 1-651-296-6000


Sunrise to sunset can run without special lighting. Up to and including 10' wide can usually run 2:00 A.M. to 10:00 P.M, weekdays and Saturdays (except for curfew areas and Friday summer restrictions, below) but must have flashing amber lights front and rear at night, and lights in place of flags and outlining vehicle and load for night running. Over 10' wide must have front and rear escorts plus lights to run before sunrise or after sunset. During summer months (Memorial Day weekend through the Friday after Labor Day), no movement from 2:00 p.m. Friday until sunrise on Saturday except for up to 9' wide on 22' or wider roadway, up to 14' high. Travel is permitted Saturday all day, and Sunday from sunrise to 12:00 noon. Over 10' wide can travel at night only with front and rear escorts and must meet all lighting requirements.


No travel on major holidays, some holiday weekends, or on Fishing Opener Weekend in May. Check with the Sammons Permit Office. For vehicles over 10' wide, over 75' long, or over 14' high, no travel in Twin City Metro area between the hours of 6:00 a.m. – 9:00 a.m. or 3:00 p.m. – 6:00 p.m. or in Duluth city limits between 7:30 a.m. – 8:30 a.m. or 4:00 p.m. – 5:30 p.m. unless specifically stated on the permit. These metro areas are defined on the OD/OW Travel Hours sheet available on their website at:www.dot.state.mn.us/cvo/oversize/permit_travel_hours.html


Width: 8'6"

Height: 13'6"

Length: 75' overall, 53' semi-trailer, 43' kingpin setting measured from kingpin to center of rear axle group.

Utility Poles are exempt from permits only if the Bill of Lading lists the load as utility poles. Pipes, beams, etc. not exempt.

Weight: 80,000 Gross on designated highways, 73,280 non-designated with 5 axles (80,000 with 6)

Steer Axle – 600 pounds per inch of tire width (13,200 pounds with 11" tires),

Tandem – 34,000 Tridem – 42,000 Single – 20,000 designated highways (18,000 other roads)


Width: 14'6", and up to 16' for certain routes

Height: 14' – 15'6" with route restrictions. Loads over 15'6" are highly restricted and a route survey is required.

Length: 95' for two-vehicle combination (wheelbase of 75'), 103' with a single pivot point

Weight:* 92,000 (5 axles) 112,000 (6 axles) 132,000 (7 axles) 144,000 (8 axles)

Single – 20,000 Tandem – 40,000 (44,000 with bridge check) Tridem – 60,000 Quad – 72,000

Steer – 600 pounds per inch of tire width (13,200 on 11" tires)

Pusher Axle – 500 pounds per inch of tire width (11,000 pounds with two 11" tires)

Loads exceeding these dimensions or weights are considered as Super Loads.


Width: Over 14'6" – 1 escort on multi-lane divided highways, 2 escorts on 2-lane highways

Police escort required if load encroaches on opposing lane

Height: Over 15'5" – 1 escort with high pole suggested, but not required. Height survey is required to get a permit for over 15'6" height.

Length: Over 95' – 1 escort; over 110' – 2 escorts.

Note: A few routes with "deficiencies" may require an extra escort.


Winter load increases (allowing 10% over maximum axle weights) usually go into effect sometime in December. The start date changes from year to year. Over legal axle/group weights are usually not allowed during the spring thaw period, usually from about February 1 or March 1 (depending on zone) through early to mid-May, then middle-range limits take effect until about May 31. Check with the Sammons Permit Office.


"Oversize Load" signs required when escorts are required or when over 12' wide. They must be lit up to run at night. Flags (18" square) are required whenever rear overhang exceeds 4', or when vehicle/load exceeds 9' in width or 75' in length. Flags should be mounted at the tip of overhang, at corners, and widest points of load. An overwidth or overlength vehicle/load requires flags at each corner of the load, with an additional flag at the widest point on each side of the load if it extends beyond the corner flags. Overhang exceeding 4' requires

light at night. Flashing amber lights are usually required on the permit when over 12' wide.

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