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Must Carry Season

Colorado’s roads can be tough for CDL drivers, especially as seasons change and winter weather sets in. This section offers helpful tools to stay prepared, including access to In-Cab Messaging for real-time updates, seasonal rules and regulations, COTrip traveler information, and chain-up tips to keep you safe and compliant on the road.

This map illustrates the routes in Colorado impacted by Colorado Senate Bill 24-100, which mandates chain requirements for commercial motor vehicles (CMVs). The bill covers seven key routes.

The Mountain Rules Resources

The Mountain Rules Truck Safety Overview

Construction Zone Safety

Truck Safety & Winter Driving in Colorado

Truck Safety & Speeding in Colorado