Michigan Truck Weight Limits and Permit Sources

At-a-glance summary

Field-level reference data

Michigan is one of the states with confirmed seasonal weight restrictions. The state publishes frost-law and spring load restriction information through MDOT — these restrictions can significantly reduce what weight is legal on state and local roads during the spring thaw period, often to values well below the normal operating limits. That seasonal dimension makes Michigan weight review notably different from states where no seasonal source was confirmed.

Reading the Michigan weight table

Weight rows use the federal Interstate baseline and the FHWA state law compilation for Michigan. Michigan has major I-75, I-94, I-96 corridors and significant industrial freight activity. Federal baseline applies on Interstate routes. For state routes and local roads, verify the FHWA state law compilation. Michigan’s seasonal restrictions during spring can substantially reduce what’s legal on those non-Interstate roads — the seasonal field is the most operationally significant low-confidence gap on this page.

Bridge formula compliance matters in Michigan, particularly on routes serving port facilities and older industrial infrastructure.

Permit and route authority in Michigan

MDOT Transport Permits handles over-limit permits for Michigan. Applications go through MDOT’s current permit system. Michigan permits cover route, dates, vehicle configuration, and axle weights. During spring restriction periods, permits for over-normal moves on restricted roads may face additional requirements. Changes to equipment or routing require permit review.

Seasonal, route, and local checks

Michigan publishes spring load restrictions through MDOT — this is a confirmed seasonal restriction program. The restrictions are date-range and route-specific rather than applying uniformly statewide, which means checking the current MDOT spring restriction schedule for the specific route is the necessary step. During restriction periods, the allowed weight on restricted roads can be substantially lower than the baseline values in the table above.

For any Michigan move that uses state or local roads in late winter or spring, the MDOT seasonal restriction page is the source to check.

Tickets and enforcement notes

No enforcement agency page was separately confirmed in this review, and no specific fine schedule was confirmed — both of those fields remain unconfirmed. If a citation is issued in Michigan, the specific Michigan statute and any court or agency instructions that accompany the citation are the starting points. The absence of confirmed sources for those fields means any fine or enforcement follow-up requires working from the actual citation document rather than this page.

Source-strength notes for Michigan

6 source records back this page. The confidence breakdown is 3 high, 23 medium, and 3 low across the field set. The seasonal field is the highest-priority area for additional research. Enforcement and fine fields are unconfirmed — a meaningful gap for any citation-related situation.

Building a Michigan source file

A Michigan dispatch file should include the MDOT permit documentation, current scale ticket, approved route, current MDOT seasonal restriction status for the route, and notes on any enforcement or fine sources checked separately. The axle weight table, permit office list, seasonal restrictions, and overweight fines pages are the supporting comparison references.

How to Read a CAT Scale Ticket covers ticket reading. How to Slide Tandems covers distribution. Bridge Formula Explained covers bridge spacing.