Winter driving on Colorado’s I-70 has always bordered on a contact sport. The state’s most important east-west artery snakes through ski traffic, high-altitude passes, and weather that can turn from sunny to Arctic in the time it takes to order a roadside latte. Now, a new law adds another wrinkle for drivers braving the mountains: if you’re in a two-wheel-drive vehicle, you’d better have snow chains in the trunk.
This season, Colorado has officially put passenger cars on the same footing as commercial semis—at least when the weather goes sideways.
Chains: Not Just for Big Rigs Anymore
According to the Colorado Department of Transportation (CDOT), the rule doesn’t ban 2WD vehicles from mountain travel. It simply demands that they follow chain requirements the same way truckers do.
“When weather changes, truckers have to pull over and put on their chains,” CDOT spokesperson Andrew Hogle told KDVR. “It’s now going to be the same for front-wheel drive or two-wheel drive vehicles.”
That’s a big shift. Historically, chain laws on I-70 targeted the massive freight haulers crawling up the Eisenhower grade. Now your Honda Accord, Toyota Camry, or rental-spec Nissan Rogue must play by similar rules—at least when the conditions call for it.
Where the Law Applies
The requirement covers Dotsero to Morrison, the trouble zone known for steep grades, whiteout squalls, and enough weekend ski traffic to make you question the concept of leisure. CDOT and the Colorado State Patrol (CSP) can also activate the rule on other highways during storms.
The traction law technically exists all winter long, but the chain-on requirement only kicks in when CDOT or CSP say conditions are severe enough. Translation: you don’t chain up by default—but you do need to be ready.
And while you’re unlikely to find chain checkpoints lining the highway, Hogle notes that troopers who stop you will likely ask whether you’re carrying the required gear.
What You’ll Need (and What Happens If You Don’t Have It)
For 2WD and FWD vehicles, the baseline is simple: carry traction devices for at least two tires. Ignore the rule, and you’re looking at a $50 fine plus fees. Cause a traffic jam because you weren’t prepared? That spikes to $500.
All-wheel drive and four-wheel drive owners shouldn’t think they’re getting a free pass, either. AWD/4WD vehicles must be equipped with winter, all-weather, or M+S tires with at least 3/16 inch of tread. Show up with worn tires and overconfidence, and you’re still on the hook.
CDOT now offers online guides for chain installation, winter gear checklists, and mountain safety tips—a not-so-subtle acknowledgment that most sedan drivers have about as much chain-installing experience as they do piloting a freightliner.
Why This Matters
Anyone who’s spent time on I-70 in winter knows the script: weather rolls in without warning, a single unprepared car loses traction, traffic grinds to a halt, and several thousand frustrated skiers contemplate turning around and taking up indoor hobbies.
The new law tries to remove the weakest link in that chain—literally.
As someone who’s lived in Colorado and driven those passes in everything from compact crossovers to rear-drive sedans, I can confirm that the weather can flip moods faster than a mountain goat spotting a camera. Preparation isn’t optional; it’s survival strategy.
Now, the state is making that preparation law.
Source: 9News