How to Ship Oversize & Overweight Loads in Michigan
Michigan figures verified against Michigan Department of Transportation (michigan.gov/mdot) · 2026-09· Last reviewed September 2026
Michigan draws its own line between ordinary freight and oversize freight, and everything above that line moves on the state's permit system: declared dimensions, approved routes, escorts where required.
Michigan oversize thresholds
- Width
- over 8.5 ft needs a permit
- Height
- over 13.5 ft needs a permit
- Gross weight
- over 80,000 lb needs a permit
- Length
- A 53 ft semitrailer is the standard; overall combination limits are state-set.
- Axles (interstate standard)
- 20,000 lb single · 34,000 lb tandem
Does your load need a permit here?
Skip the reading: enter your real dimensions and weight in the quote engine and it applies the thresholds of every jurisdiction on your actual route, prices permits and escorts where your load crosses the bands, and locks the price for 30 days.
Quote my load for Michigan →Heavy equipment, vehicles, freight, containers: all categories priced.
From routine permit to superload in Michigan
Not every permitted load is the same size of problem. Michigan tiers them:
Routine permitted
Permits issue in the normal course up to about 14 ft wide, 150 ft long.
Route-surveyed
Michigan issues single-trip permits (valid up to five days, return trip includable) and extended annual permits in categories from construction to modular homes; on restricted routes, single trips stop at 14 ft of width, 11 axles, and 150 ft of length, and axle allowances scale with tire size.
Superload
Beyond the restricted-route ceilings, moves go to individual review; Michigan also runs its own axle-based weight law, under which added axles legally carry well beyond the federal gross on Michigan-designated routes.
Permits in Michigan: who issues them
Oversize and overweight permits are issued by the MDOT Transport Permits Unit; the permit office answers at 517-241-8999. Your carrier or its permit service deals with the office directly, and the cost is in your quote when your dimensions require it.
- •Electronically submitted single-trip permits typically issue within about 12 business hours.
The escalation ladder: from legal load to the move nobody makes
As dimensions grow, requirements stack in the same order everywhere; Michigan sets the exact trigger points.
1 · Legal load
Inside the envelope above: no permit, no escorts, travels any lawful hour. Typical: a 20 ft container on a flatbed, a pickup on a hotshot, pallets in a van.
2 · Permitted, no escort
Over the envelope but inside the state's first escort band: permit, banner and flags, daylight-type windows. Typical: a 10 ft wide skid-steer-and-attachments load on a step deck.
3 · One escort
From the state's first width band (commonly in the 12 ft range): a certified pilot car leads on two-lane roads or follows on divided highways. Typical: a 12 ft wide dozer on an RGN.
4 · Two escorts / pole car
Wider still, and on two-lane routes: escorts front AND rear. Very tall loads add a height-pole car that proves every wire and bridge before the load reaches it. Typical: a 14 ft wide, 15 ft tall excavator on a lowboy.
5 · Police escort / superload
Beyond the restricted-route ceilings, moves go to individual review; Michigan also runs its own axle-based weight law, under which added axles legally carry well beyond the federal gross on Michigan-designated routes. At this scale expect route surveys, possible rolling closures, and utility crews lifting lines ahead of the convoy.
6 · Cannot move as one piece
Past what roads, bridges, and wires physically accept, or whenever the load is DIVISIBLE: authorities expect it reduced, not permitted. Booms come off, counterweights ship separately, buildings split into sections; the truly non-reducible goes to engineered transport, rail, or barge for part of the journey.
Escort requirements attach through the state's permit provisions by dimension band.
Examples are typical industry scenarios for scale, not Michigan determinations; the permit for your move states the binding requirements.
Permits, escorts, and travel windows in practice
Above the envelope, Michigan issues single-trip permits against your exact declared dimensions, often with a prescribed route, and escort vehicles attach as width and length grow: one pilot car at the first band, two beyond it, and a height-pole car for the tallest loads. Daylight travel is the working default, with tighter windows in cities and on holidays. For how each piece works everywhere, see the guides on pilot cars & escorts, permits, travel windows and spring frost laws, which apply in Michigan's climate.
Michigan's spring weight restrictions are among the continent's strictest: seasonal routes drop 25 percent on concrete and 35 percent on asphalt pavements when the annual frost orders take effect, with reduced speeds for some vehicles.
Permits in Michigan are issued by the MDOT Transport Permits Unit; your carrier or its permit service deals with the office directly.
Common questions
When does a load count as oversize in Michigan?▾
In Michigan, a load is oversize once it exceeds 8.5 ft in width, 13.5 ft in height; beyond those figures a permit is required before it moves.
Do I need to get the Michigan permit myself?▾
No. Movement permits attach to the carrier and vehicle, not to the shipper. When your dimensions require a Michigan permit, the carrier or its permit service obtains it, the cost is priced into your quote, and the paperwork rides in the cab.
Will my load need a pilot car in Michigan?▾
Escorts are triggered by width, length, and height bands that Michigan sets itself, and the count changes with road type. Your quote prices escort bands from your declared dimensions, and the permit for the move states the binding requirement.
Can oversize loads travel at night or on holidays in Michigan?▾
Daylight travel is the working default for oversize loads across North America, with curfews in major urban areas and restrictions on statutory holidays. Michigan's current windows are applied to your route during dispatch planning, and your pickup and delivery estimates already reflect them.
Related: heavy equipment shipping · all jurisdictions · other states: Alabama · Alaska · Arizona · Arkansas · California · Colorado
This guide is provided free, for general information, so shippers can see how oversize and overweight moves work. It is not legal advice and not a permit determination. Limits, escort bands, fees, and seasonal restrictions change regularly; before relying on any figure, verify it with the jurisdiction's transportation department or permit office, or a licensed permit service. When you book with LoadLoom, our dispatch desk and your assigned carrier confirm the current rules for your exact load and route; that confirmation, not this page, governs your shipment. LoadLoom is operated by ShipVista Corporation, licensed FMCSA freight forwarder FF-53801, USDOT 3852466. Last reviewed September 2026. Spot an error? Email customercare@loadloom.com with the official source and our desk will verify and update.