I grew up biking, snowboarding, and riding motorcycles in the mountains. I spent weekends snowboarding and mountain biking in Winter Park and Steamboat, and I spent a semester at Colorado Mountain College in Steamboat. That means I've driven I-70 in every season for as long as I can remember: ski traffic in January, bikes on the rack in July, and everything in between. If you drive that road enough, you learn to watch the semis. You watch them crawl up the grades, and you watch them come down the other side with their brakes smoking.
I've also spent years handling truck crash cases. The I-70 corridor creates a specific set of dangers for anyone sharing the road with an 80,000-pound truck, from the mountain passes all the way down to stop-and-go traffic in Golden and Lakewood. Here's what makes it different, and what it means if a truck hits you.
Why I-70 Is Different for Trucks
Colorado's grades aren't necessarily steeper than the mountain highways back east. They're longer. CDOT lists six sustained grades between Vail and Denver, including Vail Pass, both sides of the Eisenhower Tunnel, Georgetown Hill, Floyd Hill, and Mount Vernon Canyon. Most of them run 7%, and some go on for miles.
On a long descent, a driver who rides the brakes instead of using a lower gear and the engine brake will overheat them, and hot brakes fail. That's why I-70 has runaway truck ramps. The worst case of what happens when a truck misses one came in 2019, when a driver lost his brakes coming down Mount Vernon Canyon and caused a 28-vehicle pileup in Lakewood that killed four people.
Here's what surprises most people: bad weather isn't the main problem. According to CDOT, most crashes on the mountain corridor happen in sunny, dry conditions. And the drivers who get into trouble fit a pattern. In CDOT's records, 92% of runaway ramp incidents involved out-of-state drivers with less than five years of experience, usually on one of their first few trips through the corridor.
Brake failure is not an excuse. Federal rules require drivers to confirm their brakes work before every trip (49 C.F.R. § 392.7) and require carriers to systematically inspect, repair, and maintain their trucks (49 C.F.R. § 396.3). A truck whose brakes gave out on a 7% grade usually points to one of three things: a driver who didn't know how to descend a mountain, a company that didn't train him, or a truck that wasn't maintained.
Colorado law also lets you go after the company's own conduct. Even when a trucking company admits its driver was on the job, you can still bring claims for negligent hiring, training, supervision, and retention, and you can take the discovery that goes with them (C.R.S. § 13-21-111.5(1.5)(c)). For an inexperienced out-of-state driver on his first trip down the mountain, the training file is often where the case is.
Chain Law, Right-Lane Rules, and the Tunnel
From September 1 through May 31, commercial vehicles over 16,000 pounds must carry chains on I-70 west of Morrison. When CDOT activates the chain law, they have to put them on. During that same season, trucks are generally restricted to the right lane on the mountain corridor. A truck that gets stuck and blocks the highway faces fines up to $1,000 plus surcharges.
Passenger cars have their own rules. See my guide to Colorado's traction law and chain law. Hazardous materials trucks can't use the Eisenhower Tunnel at all. Placarded loads have to take US 6 over Loveland Pass instead, one of the most exposed roads in the state.
These rules aren't just traffic citations. When a truck driver violates a safety law meant to protect other people on the road, and that violation causes a crash, the violation can support a negligence per se claim. A truck spinning out without chains, or sitting in the left lane where it doesn't belong, is strong evidence.
Where the Mountains Meet Rush Hour
The most dangerous moment on eastbound I-70 isn't always on the pass. It's where the mountain traffic meets the metro traffic. Trucks come down Mount Vernon Canyon at speed and run straight into stopped cars at the bottom, in Golden, Lakewood, and Wheat Ridge. Farther up, construction on the Floyd Hill project continues until 2029, and it has meant years of lane shifts and traffic holds on a 7% grade.
A car stops in a short distance. A loaded semi doesn't. FMCSA says a truck at 65 mph can need up to two football fields to stop, about 40% farther than a car. Colorado law requires every driver to leave a reasonable and prudent following distance for the speed, traffic, and road conditions (C.R.S. § 42-4-1008). When a truck driver follows too closely in heavy traffic, there's no room left when the cars ahead stop.
A case from my own practice. Years ago, at a prior firm, I represented a mother and her daughter. They were in rush hour traffic on I-70 coming into Denver when a semi rear-ended them. The trucking company claimed my clients had merged in front of the truck, and it refused to accept fault, so we filed suit.
I deposed the truck driver under oath. Then I took a 30(b)(6) deposition of the trucking company itself, which requires the company to produce a witness to testify on its behalf about its policies, training, and what it knew. We went through the company's maintenance logs and records in those depositions. Once that work was done, the company paid, and both claims settled for six figures.
A disputed merge usually comes down to competing stories, and there wasn't one piece of evidence that ended the argument. What moved the case was building it under oath, piece by piece, until the company had to decide whether it wanted a jury to hear the rest. Trucking companies and their insurers don't pay just because the facts look obvious. They defend these cases hard, with lawyers working for them from the day of the crash. That's why I prepare every case as if it's going to trial.
Who Can Be Responsible in an I-70 Truck Crash
Truck cases usually involve more than one potential defendant:
- The driver, for speeding, following too closely, riding the brakes, ignoring chain law, or driving fatigued.
- The trucking company, which is responsible for its driver's negligence on the job and for its own negligence in hiring, training, and supervising him.
- Whoever maintained the truck, if the brakes or equipment failed because of bad maintenance.
- Other parties, such as a loader, shipper, or broker, depending on the facts.
Interstate for-hire carriers hauling general freight must carry at least $750,000 in liability coverage under federal rules (49 C.F.R. § 387.9), and more for hazardous materials. That coverage is a big reason these cases matter. It's also a big reason the insurer fights. For how coverage layers, future medical care, and lost earning capacity shape what a serious truck case is worth, see What Is a Catastrophic Truck Injury Claim Actually Worth in Colorado?
What to Do After a Truck Crash on I-70
The evidence in a truck case disappears faster than in a car case. The truck's engine control module records speed, braking, and throttle data. Electronic logging devices record the driver's hours. Many fleets run dashcams. Carriers only have to keep hours-of-service records for six months, and some data can be overwritten much sooner. A preservation letter needs to go out early.
If you've been hit:
- Get medical care and document everything.
- Photograph the scene. Get the truck, the trailer, the company name, and the USDOT number on the cab door.
- Look for cameras. Note nearby gas stations, parking lots, and storefronts that may have video.
- Don't give a recorded statement to the trucking company's insurer.
- Know your deadlines. Colorado generally gives you three years to file a motor vehicle injury claim and two years for wrongful death. If a government vehicle was involved, such as a CDOT plow, you may have only 182 days to give written notice.
Learn more about how I handle these cases on my truck accident page.
What It Costs to Hire Me
Truck cases often end up in litigation, which is exactly where most firms raise their fee. My fee is 29% pre-litigation and 33% if we sue, compared to the 33-35% and 40-45% most Colorado firms charge. On a $500,000 recovery in litigation, the difference between 33% and 40% is $35,000 that stays with you instead of going to the firm.
I-70 Truck Crash FAQ
Who is responsible when a truck's brakes fail on I-70?
Usually the driver, the trucking company, or both. Federal rules require drivers to check their brakes before every trip and require carriers to inspect and maintain their trucks. Brake failure on a mountain grade often traces back to poor descent technique, poor training, or poor maintenance. If a repair shop did the maintenance, it may share responsibility too.
Does a chain law violation help my case?
It can. When a truck driver violates a safety law designed to protect other drivers, and the violation causes the crash, Colorado law may treat it as negligence per se. A truck that was required to chain up and didn't, or that was in a lane it wasn't allowed in, gives you strong evidence of fault.
The truck was from out of state. Do I have to sue in another state?
Generally, no. A crash on a Colorado highway can usually be brought in Colorado court, even when the driver and carrier are based elsewhere. Many I-70 truck crashes involve out-of-state carriers.
How long do I have to file a truck accident claim in Colorado?
Generally three years from the crash for injury claims involving a motor vehicle, and two years for wrongful death. If a government vehicle was involved, you may need to give written notice within 182 days. Don't wait: the truck's electronic data can be lost long before those deadlines run.
The trucking company says the crash wasn't its driver's fault. What happens now?
That's common, even in crashes that look clear-cut. A lawsuit lets you depose the driver, depose the company through its designated witness, and get the truck's data, logs, and training records. In my experience, that's often what moves a carrier from denying fault to resolving the claim.
Past results do not guarantee a similar outcome. Every case is different.
