Picture yourself driving home on Interstate 70 after a weekend in the mountains. The snow starts falling, visibility drops and suddenly brake lights flash ahead. This scenario played out for nearly 50 drivers in late November 2025 when two pileups occurred within 15 minutes near Glenwood Springs. To help prevent these dangerous situations, Colorado enforces two critical winter driving laws you need to understand.
What the passenger vehicle traction law requires
The passenger vehicle traction law activates during winter storms or poor road conditions. The Colorado Department of Transportation (CDOT) can enforce this law on any state highway and it remains active year-round on certain parts of I-70 from September 1 through May 31.
When this law is active, your vehicle must meet specific requirements:
- AWD/4WD vehicles require proper tires: You must have tires with at least 3/16-inch tread depth and a mud and snow rating, all-weather rating or the mountain-snowflake symbol. These standards ensure your vehicle can grip slick surfaces effectively.
- 2WD vehicles must use traction devices: Tires alone will not keep you compliant. You must carry and install chains or an approved alternative traction device when highway signs indicate the law is active.
Meeting these requirements helps you stay safe and avoid citations. However, when conditions become severe, Colorado enforces an even stricter standard
When the passenger vehicle chain law takes effect
The passenger vehicle chain law usually serves as the final safety measure before highway closures. The key difference from the traction law is simple: proper tires are no longer enough.
During severe storms, all vehicles must comply with these requirements:
- Chains are mandatory for everyone: Every vehicle including AWD and 4WD must have chains or an approved traction device installed on at least two drive tires.
- Watch for electronic highway signs: CDOT announces restrictions through signage along the roadway. Check conditions before you travel and keep traction devices in your vehicle throughout winter.
Even with proper preparation, however, accidents can still happen through no fault of your own.
Get professional legal help after a winter crash
Icy roads, poor visibility and other motorists’ negligence can create dangerous situations every season. If you’ve been involved in a winter driving accident, consider connecting with an experienced personal injury attorney. A qualified lawyer can help you protect your rights and pursue fair compensation. Don’t navigate the aftermath of a crash alone