Oversize and overweight movements - Michigan (2024)

General requirements

Reducible expectationsLoads must be arranged in such a way that the dimensions of height, length, and width are kept as minimal as possible. Staggered loading is not allowed. If a loaded commodity creates a single overdimension, two or more commodities may be transported as one load as long as the permit so indicates, legal axle loadings are not exceeded, and no dimensions of width, height, or length are created or made greater by the additional commodities.
Permit timingPermit will be emailed to once it issued by MDOT Permit Gateway (MPG) computer program.
Method of applicationApplication for permits are to be made through the MDOT Permit Gateway (MPG) computer program, in person at one of MDOT's Transportation Service Centers (TSC's), or through J. J. Keller & Associates, Inc., Trip Permits, at (800) 231-5266.
Payments acceptedElectronic check or credit card.
Electronic permitsNS
Route surveysRoute determined through MDOT Permit Gateway (MPG) computer program.

Insurance requirements

Available permits and fees

Overdimension
Permit PeriodConditionsFee
Single tripOversize, legal weight$15
AnnualOverlength, legal weight$30
AnnualOverwidth, legal weight$30
AnnualAgricultural: For each truck and each trailer if legal weight$30
AnnualAgricultural: For each truck and each trailer if hauling to or from a farm only. The permit will be so noted.$10
AnnualMobile Home: For each truck and each trailer.$30
AnnualPipe or pole: For each truck and each trailer.30
AnnualMiscellaneous: For each truck and each trailer, or one permit if on the same form.$30
Overweight
Permit PeriodConditionsFee
AnnualOverweight$100
AnnualAgricultural: For each truck and each trailer if hauling overweight equipment$100
AnnualConstruction: For each truck, each trailer, and each piece of equipment which is over legal axle weight limits$100
AnnualConstruction: For each truck, each trailer, and each piece of equipment if only legal axle weights. The permit will be so noted.$30
AnnualMilk: Legal axle weights on seasonal roads during weight restrictions$100
AnnualMiscellaneous: For each truck and each trailer, or one permit if on the same form, if the object is overweight.$100
Overdimension and/or Overweight
Permit PeriodConditionsFee
Single tripOversize and/or over legal axle weight$50
AnnualOverwidth and overweight$100

Permit limitations

Permit limitations
WeightNo set maximum limit for overweight movements. Applications are considered on the basis of routes to be traveled, necessity, etc.
ConfigurationLimitation
Single tripTrip permits for construction equipment (bulldozers, mobile cranes, loaders, excavators, etc.), boats, prefabricated items such as structural steel, wood trusses, empty tanks, etc., farm equipment, or poles, pipe & similar type loads (overlength loads only) are limited to:
• 16' in width
• 15' in height
• 150' overall combination length
Annual overweight24,000 lbs per axle, not to exceed 150,000 lbs GVW
Annual overlength85' or 150' if pipe and pole with utility ladder
Annual overwidth12' 6"
Construction equipment Bulldozers, cranes, loaders, excavators, etc.
• 12' 6" in width
• 14' height
• 85' overall combination length
• 24,000 lbs per axle
• 150,000 lbs GVW
Farm equipmentWhen loaded on a trailer (permit not required if equipment is being driven or towed and can maintain posted speed)
• 15' 6" width
• 14' height
• 80' overall combination length
Poles or pipesPoles, pipes, and similar type loads
• Legal height, width, and weight
• 85' overall combination length
Boats or prefabricated items
Boats or prefabricated items structural steel, trusses, empty tanks, etc.
• 12' 6" in width
• 14' height
• 85' overall combination length
Logging trailer• 9' width
• 13' 6" height
• 75' trailer length
• 42' truck length
• Legal weight
Pavement marking• 8' width
• 13' 6" height
• 40' truck length
• Limited to an overload of 20% not to exceed 700 lbs per inch of tire tread width
Raw forest products• 8' 6" in width
• 13' 6" height
• 85' overall combination length
• 90,000 lbs GVW with specific axle weight limitations. Travel on specific routes between Michigan and Wisconsin only.
Rubbish• 8' width
• 13' 6" height
• 40' truck length
• Limited to an overload of 20% not to exceed 700 lbs per inch of tire tread width
Snow• 12' 6" in width
• 14' height
• Cannot be overweight, not issued for belly blades, not issued for movement on Interstates
Wreckers• 12' 6" width
• 14' height
• Limited to an overload of 20% not to exceed 700 lbs per inch of tire tread width. Travel from the original point of disablement is limited.
Milk• 8' width
• 13' 6" height
• 59' overall combination length
• Overweight only issued during spring weight restrictions on rigid and flexible pavements

Signs

General sign requirementLoads 14'6" high and above, and loads 10' wide and over require two signs.
Escort sign requirement
TypeSizeLetteringBackground
General signsOVERSIZE LOAD7' x 18"10" black block letteringYellow
Escort signsOVERSIZE LOAD5' x 12"8" black letteringYellow

Lights

General light requirementsLighting requirements are decided by the permit office on a case-by-case basis.
Escort light requirementsRequired
TypePlacement
General light type and placementAmber/red lightsLoads with projected loads require red lights to indicate sides. Amber lights as required per load.
Escort light type and placementAt least 1 flashing or rotating amber lightDisplayed on the top of the cab visible for a distance of 500'

Flags

TypeSizePlacement
General FlagsSix red or orange warning flags18" squareEach end of front bumper, each corner of the load, any part of load that extends beyond corner flags, 1 at widest point of each side.
Escort FlagsNSNSNS

Escort vehicle markings

SizePlacementContent
NSNSNS

Escort/flagperson requirements

A rear escort is required on all movements exceeding 12 feet in width. An escort is required at both the front and rear on all movements exceeding 14 feet in width.

In addition, all overwidth vehicles planning to cross the Mackinac Bridge must arrange for an escort in advance, and must contact the Mackinac Bridge Authority 24 hours prior to crossing.

Loads over 14 feet 6 inches high must be preceded by an escort vehicle equipped with a sensing device. Loads over 15 feet high also require a rear escort.

One escort is required for overlength movements of 90 feet to 100 feet, two escorts required for movements over 100 feet in length.

Escort car/company requirements

An escort vehicle must be a passenger car or pickup truck with at least one flashing or rotating amber light displayed on top of the cab. Flashing or rotating lights must be visible for 500 feet.

There must also be displayed on the roof of the escort vehicle, one OVERSIZE LOAD sign five feet long by 12 inches high with eight-inch high black letters on yellow background.

Travel restrictions

DaytimePermits are issued for daylight hours between one-half hour before sunrise and one-half hour after sunset. In some instances, other time limitations may be applied.
WeekendPermits will not be issued for movement on Saturdays or Sundays, in some instances, other time limitations may apply.
HolidaysWhen a holiday occurs on a Friday or Monday, permits are not be valid beginning noon before the three day weekend and ending at daylight of the first day after the three day weekend.

Permits are not be issued for movement from 12:00 noon on the day preceding and continuing until daylight of the first day after the following holidays:
• New Year’s Day
• Labor Day
• Memorial Day
• Independence Day
• Thanksgiving Day
• Christmas Day

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Oversize and overweight movements - Michigan (2024)
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