Understanding Colorado’s Traction “Chain” Laws

Colorado’s breathtaking mountain landscapes and world-class ski resorts attract millions of visitors each year. However, the state’s challenging winter driving conditions necessitate special regulations to ensure road safety. Whether you’re planning a ski trip, recently moved to Colorado, or are a commercial truck driver passing through, understanding Colorado’s traction laws is crucial for a safe journey. Colorado’s traction laws, also known as the “Chain Law” for vehicles, are designed to reduce accidents and keep traffic flowing smoothly during adverse weather conditions. These laws apply to both passenger cars as well as commercial trucks, with specific requirements for each.

When and Where Traction Laws Apply

Colorado’s traction laws are in effect from September 1 to May 31 on Interstate 70 between Dotsero and Morrison. This 126-mile stretch of mountain highway is particularly prone to severe winter conditions and sudden weather changes. However, it’s important to note that these laws can be implemented on any state highway during adverse weather, regardless of the time of year.

The Colorado Department of Transportation (CDOT) activates traction laws based on current and forecasted road conditions. When activated, these laws require all vehicles to have proper equipment for snow and ice. Drivers should pay attention to electronic message boards along highways for real-time information about traction law status.

Areas Most Frequently Affected by Colorado “Chain” Law

• The Vail Pass
• Eisenhower Tunnel
• US 6 Loveland Pass
• US 285 Kenosha Pass
• US 24 Ute Pass

Chain Law Requirements for Passenger Vehicles

Compliance with traction laws for passenger vehicles involves having the right tires or traction devices. Here’s a detailed breakdown of the requirements:

Tire Requirements

All passenger vehicles must have one of the following:

1. Winter tires (mountain snowflake symbol on the sidewall)
2. All-season tires with mud and snow (M+S) designation
3. Tires with an all-weather rating

Regardless of the type, all tires must have a minimum tread depth of 3/16 inch. This depth is crucial for maintaining traction on snowy or icy roads. To check your tire tread depth, you can use the “Quarter Test.” Insert a quarter into the tire tread with George Washington’s head pointing down. If the top of his head is visible, your tires don’t meet the minimum tread depth requirement.

Vehicle Type Considerations

Four-wheel or all-wheel drive vehicles generally comply with traction laws if they have adequate tire tread. However, two-wheel drive vehicles must have appropriate tires as listed above.

Alternative Traction Devices

If your vehicle doesn’t meet the tire requirements, you can use chains or alternative traction devices like AutoSock. These devices provide additional grip on snowy or icy roads and can be lifesaving in challenging conditions.

Here’s a table summarizing the passenger vehicle requirements:

Vehicle Type	Tire Requirements	Alternative Options
4WD/AWD	All-season, winter, or all-weather tires with 3/16″ tread depth	Chains or AutoSock
2WD	Winter tires or all-season/all-weather tires with M+S designation and 3/16″ tread depth	Chains or AutoSock

Requirements for Commercial Vehicles

Commercial vehicles have more stringent requirements under Colorado’s Chain Law. These requirements vary based on the vehicle’s Gross Vehicle Weight Rating (GVWR) or Gross Combined Weight Rating (GCWR). Here’s a detailed breakdown:

Vehicles with GVWR/GCWR of 16,001 to 26,000 pounds

These vehicles must carry sufficient chains to be equipped on two drive tires. When Chain Law is in effect, drivers must install chains on at least two drive tires[1].

Vehicles exceeding 26,000 pounds GVWR/GCWR

These larger commercial vehicles must carry sufficient chains to be equipped with four-wheel drive tires. When the Chain Law is in effect, drivers must install chains on four-wheel drive tires.

It’s important to note that commercial vehicles must carry chains or alternative traction devices from September 1 to May 31, regardless of the current weather conditions. This ensures drivers are prepared for sudden weather changes, common in Colorado’s mountain passes.

Enforcement and Penalties of Colorado Traction Law

The Colorado State Patrol is responsible for enforcing traction laws. These laws are typically enforced as secondary offenses, meaning drivers are usually cited for violating traction laws in conjunction with another offense or being involved in an accident.

Violations of traction laws can result in significant fines:

• The base fine for passenger vehicles is $130.
• If a violation results in the closure of one or more traffic lanes, the fine increases to $650.
• For commercial vehicles, fines can range from $500 to $1,000, depending on the severity of the violation.

In addition to fines, drivers may be liable for damages or injuries caused by accidents caused by inadequate traction equipment. This can include road closures, emergency response, and vehicle recovery costs.

Colorado’s traction laws play a vital role in maintaining safe travel conditions during the winter months. By understanding and complying with these regulations, you avoid fines and contribute to safer roads for everyone. Whether visiting for a ski trip, being new to Colorado, or driving a commercial truck, being prepared with the right equipment and knowledge is vital to a safe and enjoyable journey through the state’s beautiful but challenging mountain roads.

Staying Informed

One of the most critical aspects of complying with Colorado’s traction laws is staying informed about current conditions and restrictions. CDOT provides several resources for travelers so that you are always informed about the latest developments with the Chain Law and how it will affect your travels:

• COtrip.org: This website offers real-time road conditions, webcams, and information on road closures and restrictions.
• 511 phone service: Dial 511 within Colorado for up-to-date road condition information.
• CDOT Mobile App: This app is available for iOS and Android and provides real-time travel information.
• Social media: Follow CDOT on Twitter (@ColoradoDOT) for immediate updates.