Seasonal Weight Restriction

Seasonal Weight Restrictions

One of the most common business interactions with a county road agency concerns seasonal weight restrictions – sometimes called “frost laws.” 

While roads are concrete and asphalt and look indestructible, they can actually be quite fragile in late winter as frost comes out of the ground.  Even strong late-winter sunlight on the dark paved surface has a significant impact on a road.

As frost melts beneath a paved road, the roadbed turns wet and spongy because water is trapped between the pavement and the remaining ice layer beneath.  When trucks and heavy equipment travel over a layer of concrete or asphalt that isn’t well supported beneath, lots of permanent cracks can occur.

Seasonal weight restrictions in effect.  Road commissions must strike a balance between “business as usual” and protecting the roads, and most of them employ licensed Professional Engineers (PEs) to make these decisions.  Most usually consult neighboring road agencies, as well.

By law, road agencies can enact weight restrictions on any roads not designed as “all season” roads.  All season roads are much thicker and designed to allow trucking year around.

Seasonal weight restrictions lower axle-loading limits and reduce maximum travel speeds for certain vehicles.  Click here for details about seasonal weight restrictions and their effect on axle loading and speed limits.

Note that some limited classes are exempt from these restrictions after a permit is filed.

For spring weight restriction bulletins from MDOT on the Trunkline System, click here.

For MDOT's information resource for commercial trucking, click here.


Weight Restriction

Alcona Alger Allegan Alpena Antrim Arenac Baraga Barry Bay Benzie Berrien Branch Calhoun Cass Charlevoix Cheboygan Chippewa Clare Clinton Crawford Delta Dickinson Eaton Emmet Genesee Gladwin Gogebic Grand Traverse Gratiot Hillsdale Houghton Huron Ingham Ionia Iosco Iron Isabella Jackson Kalamazoo Kalkaska Kent Keweenaw Lake Lapeer Leelanau Lenawee Livingston Luce Mackinac Macomb Manistee Marquette Mason Mecosta Menominee Midland Missaukee Monroe Montcalm Montmorency Muskegon Newaygo Oakland Oceana Ogemaw Ontonagon Osceola Oscoda Otsego Ottawa Presque Isle Roscommon Saginaw Sanilac Schoolcraft Shiawassee St. Clair St. Joseph Tuscola Van Buren Washtenaw Wayne Wexford
Green - no seasonal restrictions in effect
Red - indicates restrictions are in effect
Grey - restrictions are in effect in part of the county
Yellow - restriction status is unknown
County Name In Effect Roads Last Updated
Alcona No Online 6/15/2018
Alger No Online 6/15/2018
Allegan No Online 6/15/2018
Alpena No Online 6/15/2018
Antrim No Online 5/4/2018
Arenac No Online 6/15/2018
Baraga No N/A 6/15/2018
Barry No Online 6/15/2018
Bay No Online 6/15/2018
Benzie No Online 6/15/2018
Berrien No Online 6/15/2018
Branch No List 6/15/2018
Calhoun No Online 6/15/2018
Cass No Online 6/15/2018
Cheboygan No N/A 6/15/2018
Chippewa No N/A 5/25/2018
Clare No Online 4/17/2018
Clinton No Online 6/15/2018
Crawford No N/A 6/15/2018
Delta No List 6/15/2018
Dickinson No Online 5/23/2018
Eaton No Online 4/6/2018
Emmet No Online 6/15/2018
Genesee No N/A 4/12/2018
Gladwin No List 4/27/2018
Gogebic No Online 5/30/2018
Grand Traverse No Online 6/15/2018
Gratiot No Online 6/15/2018
Hillsdale No Online 6/15/2018
Houghton No Online 6/13/2018
Huron No Online 6/15/2018
Ingham No Online 4/2/2018
Ionia No Online 6/15/2018
Iosco No Online 6/15/2018
Iron No List 6/13/2018
Isabella No Online 6/15/2018
Jackson No Online 6/15/2018
Kalkaska No Online 5/7/2018
Kent No Online 6/15/2018
Keweenaw No Online 5/23/2018
Lake No N/A 6/15/2018
Lapeer No Online 4/12/2018
Leelanau No List 5/7/2018
Lenawee No Online 6/15/2018
Livingston No N/A 6/15/2018
Luce No List 5/30/2018
Mackinac No List 6/15/2018
Macomb No List 6/15/2018
Manistee No List 6/15/2018
Marquette No Online 5/29/2018
Mason No Online 6/15/2018
Mecosta No List 6/15/2018
Menominee No N/A 6/15/2018
Midland No Online 6/15/2018
Monroe No Online 6/19/2018
Montcalm No Online 6/19/2018
Montmorency No Online 6/19/2018
Muskegon No List 6/19/2018
Newaygo No List 6/19/2018
Oakland No N/A 6/19/2018
Oceana No Online 6/19/2018
Ogemaw No List 6/19/2018
Ontonagon No Online 5/23/2018
Osceola No List 4/25/2018
Oscoda No Online 6/19/2018
Otsego No List 6/19/2018
Ottawa No N/A 6/19/2018
Roscommon No Online 6/19/2018
Saginaw No N/A 6/19/2018
Sanilac No N/A 6/19/2018
Shiawassee No Online 6/19/2018
St. Clair No N/A 6/19/2018
St. Joseph No N/A 6/19/2018
Tuscola No Online 6/19/2018
Van Buren No Online 6/19/2018
Wayne No List 6/19/2018
Wexford No Online 6/19/2018

Click here for a list of contact information for county road agencies.