Michigan : permis hors normes

Fiabilité des données : Medium. Nous n'avons pas pu corroborer entièrement chaque valeur de cette page auprès d'une source officielle primaire. Considérez-les comme un point de départ et confirmez auprès du bureau des permis avant de planifier un transport.
Legal dimensions (T-1), travel/weekend/holiday (T-2 + official MDOT FAQ), superload limits (T-2), portal/phone from official MDOT documents. Escort dimension thresholds NULLED because they are NOT in MDOT's official T-1/T-2 (only equipment specs are) - do not publish unofficial numbers as fact; escort_notes carries the caution. NOTE: legal_max_gross_lbs=80000 is the federal/bridge-formula figure; Michigan uniquely allows higher legal gross on state trunklines via axle count (up to ~164,000 lbs on 11 axles). Width 102 designated highways (96 non-designated); length 65 truck+semitrailer designated (semitrailer alone 53).

Dimensions maximales légales (sans permis)

Largeur

8ft (96in)

Hauteur

13.5ft (162in)

Longueur maximale de la semi-remorque

53ft sur les routes désignées · 50ft ailleurs

Longueur maximale d’un véhicule à une seule unité

40ft

Poids brut

80,000 lbs

Essieu simple

18,000 lbs

Essieu tandem

32,000 lbs

MCL 257.717: the total outside width of a vehicle or load shall not exceed 96 in (8 ft). ⚠️ 102 in (8 ft 6 in) applies ONLY on DESIGNATED highways (MDOT T-1) — the figure shown is the one that holds on every Michigan highway. Michigan cannot be expressed as a single width: check the MDOT Truck Operators Map for which highways are designated before planning above 96 in. The same designated/non-designated split governs semitrailer LENGTH here (53 ft designated / 50 ft non-designated).

Source officielle de cette limite de largeur →

MCL 257.722 sets AXLE weight limits, not a gross cap — Michigan gross weight is whatever the axle count, spacing and function allow under the state axle-spacing formula (the "Michigan Bridge Formula"). ⚠️ On non-Interstate state highways this permits a normal legal gross of UP TO 164,000 lb for the 11-axle tractor-semitrailer-trailer configuration Michigan allows (axles have been capped at eleven since 1967) — the highest legal gross in North America, and available WITHOUT an overweight permit. On the INTERSTATE system the federal 80,000 lb limit still applies. The 80,000 lb figure shown is the conservative one that holds everywhere; 164,000 lb requires the full 11-axle configuration and compliance with the spacing formula, so confirm your exact configuration with MDOT before loading above 80,000 lb.

MCL 257.719: a vehicle unloaded or with load shall not exceed a height of 13 ft 6 in (162 in). ⚠️ The owner of a vehicle that collides with a lawfully established bridge or viaduct is liable for ALL damage and injury resulting from a collision caused by the height of the vehicle. (Note: MCL 257.717 is the WIDTH section — a common mix-up.)

Source officielle de cette limite de hauteur →

MDOT T-1 (rev. 05/2024): "Length of combination of truck-tractor and semitrailer with or without load ... NO LIMITATION (provided semitrailer lengths do not exceed limits for non-designated and designated highways)." Semitrailer including load: 53 ft on DESIGNATED highways, 50 ft on NON-DESIGNATED. "Length of semitrailers longer than 50 feet shall operate on designated highways only." Any other single vehicle: 40 ft. ⚠️ OUR PREVIOUS 65 FT WAS WRONG IN THE MOST DANGEROUS WAY: 65 ft is the "truck and semitrailer" figure — a STRAIGHT TRUCK pulling a semitrailer — on designated highways only, and is also the 3-unit combination limit. It is neither the semitrailer limit nor the tractor-semitrailer limit. Two failures followed: (1) Michigan sets NO overall limit at all for truck-tractor + semitrailer, so 65 under-reported it; (2) the number that actually governs is the SEMITRAILER, so a carrier trusting 65 could run a 53 ft trailer onto a non-designated highway where 50 ft is the ceiling. Michigan cannot be represented by one number — check the MDOT Truck Operators Map for which highways are designated. Width also differs by class (96 in vs 102 in). Michigan's single-axle limit of 18,000 lb is separately lower than federal.

Source officielle de ces limites de longueur →

Seuils d'escorte / voiture-pilote (consultez le glossaire pour les termes, les exigences de certification pour le conducteur)

Cette administration ne publie aucun seuil d'escorte à l'échelle du territoire : les exigences sont fixées comme conditions de chaque permis individuel. Les valeurs ci-dessous constituent la meilleure indication disponible de sources secondaires, et non le règlement. Vous devez les confirmer auprès du bureau des permis avant de partir.

Escorte avant requise au-delà de

12ft de largeur

Escorte arrière requise au-delà de

12ft de largeur

Les deux escortes requises au-delà de

14ft de largeur

Escorte de hauteur requise au-delà de

14ft de hauteur

CAUTION - Michigan escort dimension thresholds are NOT published in MDOT's official T-1/T-2 guides (which give only escort-vehicle equipment specs: passenger vehicle, amber light visible 500 ft, 5'x12" OVERSIZE LOAD sign). Verify escort requirements on each permit's special-provisions sheet with the MDOT Transport Permit Office. Widely-reported (unofficial) thresholds for reference only: rear escort ~over 12' wide; front and rear ~over 14' wide; front height-sensing escort ~over 14'6" high; overlength 90-100' one escort, over 100' two.

Restrictions de circulation

Circulation de nuit

Généralement restreinte

Circulation en fin de semaine

Généralement permise

Circulation le dimanche

Généralement permise

Per MDOT T-2 and the MDOT OSOW FAQ: permits are issued for daylight hours only (1/2 hr before sunrise to 1/2 hr after sunset), Monday-Friday. Weekend movement is allowed ONLY for loads not exceeding 10' wide, 14' high, and 90' long - all day Saturday and until 3 p.m. Sunday; mobile/modular homes are NOT eligible for weekend movement. No overweight permits are issued during the spring thaw weight-restriction period, and no permits over 14' wide during spring restrictions.

Interdictions les jours fériés : No movement from noon the day preceding until daylight the first day after: New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, Christmas Day. When a holiday falls on Friday or Monday, the blackout covers the whole three-day weekend.

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Seuils de super-charge

Largeur supérieure à

16ft

Hauteur supérieure à

15ft

Longueur supérieure à

150ft

Per MDOT T-2: single-trip permits are not issued above 16' wide (192 in), 15' high (180 in), or 150' overall length. Loads exceeding these are handled as superloads requiring special consideration - written justification, MiTRIP application, and Route Survey Certification (Form 2465) submitted to the Lansing Transport Permit Office at least 10 working days ahead. No fixed superload weight; extended-permit gross generally capped at 150,000 lbs.

Coût estimé du permis Vérifiez avant de vous y fier

$15 oversize-only / $50 overweight

⚠ Statute includes a CPI-escalation clause — the actual current fee may run above the listed figure.

Source : MCL 257.725 — vérifiez le tarif en vigueur auprès du bureau de permis avant de budgéter un transport.

Frais de permis seulement — n'inclut pas les coûts du service d'escorte/voiture-pilote (au prix du marché, organisés séparément) ni les frais de services de permis tiers. Il s'agit d'une estimation à des fins de planification, pas d'une soumission.

Obtenir un permis

Portail en ligne

https://www.michigan.gov/mdot/business/permits/oversize-overweight

Téléphone

517-241-8999

Michigan single axle limit 18,000 lbs (lower than federal). Spring weight restrictions common statewide.

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