Trucking Regulations in Michigan
Complete guide to weight limits, speed limits, permits, chain laws, and special rules for commercial truck drivers operating in Michigan.
Max Gross Weight
164,000 lbs on designated state routes (highest in the US)
Truck Speed Limit
65 mph on rural interstates
Diesel Tax
$0.488 per gallon diesel + federal (among highest in US)
Weight & Size Limits in Michigan
| Measurement | Limit |
|---|---|
| Max Gross Vehicle Weight | 164,000 lbs on designated state routes (highest in the US) |
| Max Axle Weight | 18,000 lbs single axle, 32,000 lbs tandem (bridge formula varies by axle count) |
| Max Trailer Length | 53 ft trailer on interstates, longer combinations on state routes |
| Max Width | 102 inches |
| Max Height | 13'6" |
Speed Limits for Trucks in Michigan
Rural Interstate
75 mph cars, 65 mph trucks
Urban Interstate
55-65 mph
Truck-Specific
65 mph on rural interstates
Fuel Tax & Tolls in Michigan
Diesel Fuel Tax
$0.488 per gallon diesel + federal (among highest in US)
Toll Roads & Bridges
Mackinac Bridge (I-75, $15 for trucks). International Bridge to Canada (Sault Ste. Marie). Ambassador Bridge and Gordie Howe International Bridge (Detroit-Windsor).
Chain Laws & Weather Requirements
No chain law, but winter tires strongly recommended. Michigan winters are severe with lake-effect snow.
Oversize & Overweight Permits
MDOT Permits Unit. Michigan's unique weight laws require understanding of axle spacing rules. Online permitting available.
Port of Entry & Weigh Stations
Weigh stations on I-94, I-75, I-96, I-69. Michigan State Police commercial vehicle enforcement is very active. Border crossing enforcement at Detroit and Port Huron.
Special Rules for Michigan
Hazmat Route Restrictions
Hazmat restricted on Mackinac Bridge (escort required for some classes). Hazmat restrictions in downtown Detroit near border crossings. Designated routes through Grand Rapids and Lansing.
Rest Area & Parking Rules
Rest areas allow overnight parking. Michigan has good rest area coverage. No specific time limits at most locations. No state anti-idling law.
DOT Inspection Frequency
High. Michigan State Police Motor Carrier Division is very active with focus on weight compliance, border crossing credentials, and winter safety equipment.
Looking for Trucking Jobs in Michigan?
Browse CDL driver positions and connect with carriers operating in Michigan.
Frequently Asked Questions About Michigan Trucking Regulations
Why does Michigan allow 164,000 lb trucks?
Michigan's unique weight law, dating to the 1960s, allows up to 164,000 lbs on designated state routes by using special multi-axle configurations (up to 11 axles). The law was designed to support Michigan's heavy industries (auto manufacturing, mining, forest products). Weight is calculated based on axle spacing, not just axle count, under a formula unique to Michigan.
How do Michigan's weight laws work?
Michigan uses an axle-spacing-based weight formula rather than the federal bridge formula. By increasing the number of axles and spacing between them, much higher gross weights are permitted on state roads. Interstate highways still follow the federal 80,000 lb limit. Carriers must understand Michigan's specific axle configuration rules to maximize legal weight.
What is the truck speed limit in Michigan?
Michigan has a differential speed limit: passenger vehicles can travel 75 mph on rural interstates while trucks are limited to 65 mph. Urban interstates are 55-65 mph. The 10 mph differential is strictly enforced.
How does lake-effect snow impact Michigan trucking?
Western Michigan and the Upper Peninsula experience intense lake-effect snow from Lake Michigan and Lake Superior. I-94 between Kalamazoo and Benton Harbor, US-31, and US-2 in the UP can receive 12+ inches in a single storm. Highway closures are not uncommon during severe lake-effect events.
What are the international border crossing requirements?
Detroit-area border crossings (Ambassador Bridge, Gordie Howe Bridge, Detroit-Windsor Tunnel) and the Blue Water Bridge in Port Huron require FAST cards or enhanced CDLs for expedited processing. C-TPAT enrollment helps with wait times. Border crossing delays can be 1-4 hours during peak periods.