Heading up to Colorado’s mountains? Whether you’re chasing fresh powder or scenic views, one thing is certain: if you’re driving on the I-70 mountain corridor, understanding and abiding by Colorado’s Passenger Vehicle Traction Law isn’t just a suggestion—it’s a legal requirement. Failure to comply can result in citations, fines, and dangerous situations. Thankfully, with the right preparation—and a little help from GoI70.com/winter—you can stay safe and avoid costly mistakes.
What is the Traction Law?
Every September through May, Colorado’s Traction Law is in effect along the I-70 mountain corridor. The law mandates that all passenger vehicles must meet specific traction requirements. You need to have either:
- 4WD or AWD vehicle with at least 3/16” tread depth
- Tires with a mud and snow (M+S) designation & 3/16” tread depth
- Winter tires (mountain-snowflake icon) & 3/16” tread depth
- All-weather-rated tires by the manufacturer & 3/16” tread depth
- Chains or an AutoSock
Why is this Important?
The I-70 mountain corridor’s steep grades and unpredictable weather make adequate tires a necessity, not a luxury. Without proper traction, you risk losing control of your vehicle, getting stuck, or worse—causing a crash.
The Wednesday before Thanksgiving 2024, the Colorado State Patrol issued 50 citations to motorists not complying with the law, many of whom were driving rental vehicles. The message is clear: ignorance of the law won’t save you from a ticket.
How to Check Your Tires
Not sure if your tires are compliant? Perform the quarter test:
- Insert a quarter into the tire tread, upside down, with Washington’s head first.
- If the tread covers the top of his head, you’re good to go. Make sure to check multiple points around each tire!
- If it doesn’t, it’s time for new tires.
Renting a Car? Be Extra Cautious
If you’re renting a car, don’t assume it’s equipped for mountain driving. Ask the rental company about the tire specifications, and verify by doing the quarter test yourself. Remember: if you get a citation, you’re responsible for paying the fine—not the rental company.
AutoSock: A Simple Solution
Consider investing in an AutoSock. This easy-to-install traction device is legal under Colorado’s Chain Law and can be a lifesaver in a pinch. Learn more about where to find them at GoI70.com/autosock.
Play It Safe: Consider Transit Options
Driving in mountain conditions isn’t for everyone, and that’s okay. For a stress-free trip, consider leaving the driving to the experts. Explore your options at GoI70.com/transit.
Bottom Line
Whether you’re a local or a visitor, complying with Colorado’s Traction Law is essential for your safety and wallet. Before you go, visit GoI70.com/winter as your go-to resource for winter driving on the I-70 mountain corridor.