What is the difference between Wisconsin Class A and Class B highways?

Class A highways permit full legal weight (80,000 lbs GVW, 20,000 lbs single axle, 34,000 lbs tandem). Class B highways derate maximum gross weight to 60% of legal limit unless a special permit is granted.

What is Wisconsin's Frozen Road Declaration?

WisDOT issues seasonal Frozen Road declarations allowing timber and unrefined forest haulers to increase gross weight up to 98,000 lbs on designated northern highways when ground freezes to a depth of at least 18 inches.

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Wisconsin Class A & Class B Highway Truck Weight Regulations

Complete operational manual covering WisDOT highway classifications, Class B 60% gross weight restrictions, agricultural and dairy transport permits, and Frozen Road season weight bonuses.

Class A Highway Standard

Designated state trunks and interstates (I-94, I-90, I-43, I-41, US-10) permit standard federal Bridge Formula limits: 80,000 lbs GVW, 20,000 lbs single axle, and 34,000 lbs tandem axle.

Class B Road 60% Derating

Secondary county and town roads designated as Class B enforce a mandatory 60% weight reduction (48,000 lbs GVW limit) unless an annual or single-trip permit is posted.

Wisconsin Frozen Road Law

During winter months when WisDOT declares 'Frozen Road Law', forestry and raw timber carriers gain a 22.5% gross weight bonus up to 98,000 lbs without requiring individual oversize permits.

Wisconsin Highway Weight Compliance Estimator

Dispatched Gross Vehicle Weight (lbs)

Target Roadway Classification

Number of Vehicle Axles

Compliance Status & Maximum Allowable Gross Weight:

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WisDOT Commercial Axle & Statutory Limits

Axle / Vehicle Spec	Class A Highway Limit	Class B Road Limit (60%)	Exspeedite TMS Safeguard
Steering Axle	20,000 lbs (Tire rating dependent)	12,000 lbs	Front axle tire ply rating verification
Single Drive Axle	20,000 lbs	12,000 lbs	Automated CAT Scale weight import
Tandem Axle Assembly	34,000 lbs	20,400 lbs	Automated tandem pin slider warning
Raw Milk Hauling Exemption	Up to 98,000 lbs (Permitted)	Subject to local posting	Specialized dairy tariff rate assignment

Schedule a Wisconsin Freight Route & Weight Review with Scott Elliott

Learn how Exspeedite automates Wisconsin Class B avoidance, milk and timber weight permits, and quarterly IFTA filing.