Passenger Vehicle Traction and Chain Laws

Overview

When weather conditions warrant, CDOT implements Traction and Chain Laws. Motorists will be alerted to an active Traction Law or Chain Law by highway signage, COtrip.org and traffic/roadway condition alerts. 

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Traction Law Updates - Fall 2025

During winter storms, or when conditions require, CDOT will implement the Passenger Vehicle Traction (PVT) law. CDOT can implement traction and chain laws on any state highway. During a traction law, all motorists are required to have:

1. All-wheel drive (AWD)/four-wheel drive (4WD) vehicles with tires designated as mud and snow (mountain-snowflake icon or M+S or M/S denoted) and 3/16-inch tread depth, or
2. AWD/4WD vehicles with winter tires (mountain-snowflake icon or M+S or M/S denoted) and 3/16-inch tread depth, or
3. AWD/4WD vehicles with an all-weather rating by the manufacturer and 3/16-inch tread depth, or
4. Chains or an approved alternative traction device

Passenger Vehicle Chain Law Updates

During severe winter storms, CDOT will implement the passenger vehicle chain law. This is the final safety measure before the highway is closed.

When the passenger vehicle chain law is in effect, every vehicle must have chains or an approved alternative traction device.

Fines

The penalty for non-compliance includes a $50 fine and $17 surcharge.

Have questions? Visit CDOT's Winter Wise Frequently Asked Questions page!