Heading into early April, spring weight restrictions across Michigan are still changing as thaw conditions evolve. The Michigan Department of Transportation confirmed late in March that it is continuing its annual process of adjusting restricted areas to protect roadways during the seasonal transition.
Southern Routes Reopen to Full Weight
MDOT lifted weight restrictions at 6 a.m. on Monday, March 30, across a wide stretch of southern Michigan. That update applies to state trunkline highways from the southern border north to and including US-10 in Ludington, then east through Clare County and over to Bay City, covering the Thumb region.
That shift restores normal hauling capacity across several key corridors, easing some pressure for loads moving through the lower half of the state.
Northern Michigan Still Under Restrictions
Outside of that zone, limits are still in place. All state trunkline highways north of the US-10/M-25 line remain under frost restrictions, including the Upper Peninsula and Mackinac Island.
Drivers running those lanes need to continue factoring in reduced weights and possible delays tied to seasonal enforcement.
What Changes Depending on the Route
Restrictions vary based on how each road is classified:
- All-season routes allow standard axle weights with no seasonal reduction
- Seasonal routes require a 25 percent reduction on concrete roads and 35 percent on asphalt
- Some restricted roads also carry a 35 mph speed limit for certain vehicles
Permit rules are also tightened in these areas. Extended permits remain valid for oversize loads, but single-trip permits are not issued for overweight freight or loads exceeding 14 feet in width, 11 axles, or 150 feet in total length on restricted routes.
Why Enforcement Tightens in Spring
These restrictions are tied to road stability. As frost leaves the ground, moisture weakens the base layers under pavement, making roads more vulnerable to heavy loads.
MDOT tracks frost depth, weather patterns, and road conditions to determine when areas can safely return to normal weight limits. Until then, restrictions stay in place to prevent long-term damage.
What This Means for April Freight Planning
With April freight demand starting to build, these changing zones can impact routing, timing, and permit strategy. Loads moving between unrestricted and restricted areas may need adjustments to stay compliant.
Local roads can also carry their own limits, which don’t always line up with state routes. Posted signage will indicate those restrictions.
Where to Check for Updates
For current information, drivers can call 800-787-8960 or visit MDOT’s website at Michigan.gov/Truckers under “Restrictions.” Email alerts are available for ongoing updates.
Trucking companies based in New Jersey and Canada can call 517-373-6256 for details.
