Rear-end collisions in Colorado: Who’s really at fault?

This feels like an easy trivia question, right? Most people think that if you get rear-ended, it’s always the driver’s fault who rear-ended you. Not always. That’s the general rule, and for good reasons. Most of the time it holds up and most of the time it is fair. But “most of the time” is not “always,” and the exceptions can matter when you’re the one dealing with the injuries, the medical bills, and the insurance company.

Here’s what Colorado drivers should know about fault in a rear-end collision, and why the answer can sometimes be more complicated than it looks.

Why the driver behind is usually at fault

The rule exists for a simple reason: the driver in front has no control over the distance between vehicles. The driver in front cannot maintain a safe distance. The driver in front can’t make the driver in back put down their phone or stop tailgating. Every one of us has to trust the drivers behind us to decide how much space is safe for the speed, the weather, and the traffic around them.

That’s why every driver’s ed handbook drills the same lesson into new drivers: leave enough room to stop, even if something unexpected should happen. These handbooks even include handy diagrams for the size of vehicle, with bigger vehicles like semi-trucks requiring more room to stop safely.

The law reinforces it because the entire point of a safe following distance is to give you room when something unexpected happens. Colorado Revised Statues Section 42-4-1008 states: “The driver of a motor vehicle shall not follow another vehicle more closely than is reasonable and prudent, having due regard for the speed of such vehicles and the traffic upon and the condition of the highway.”

That phrase, “reasonable and prudent,” is meant to account for allowing enough space for something unexpected to happen. A deer runs into the road. Traffic slows down four cars ahead. A driver hits the brakes for a reason you can’t see. Something unexpected eventually happens.

If the driver behind did not leave enough space to stop safely, that’s usually on them. A sudden stop by the car in front does not erase the obligation to keep a safe distance. That’s the reason the rule is generally that the driver behind is at fault in a rear-end collision.

When the rule does not apply

There are some situations where the driver in the back is not the one at fault. Here are the most common ones we see at Ready Law.

Brake checking

Brake checking is when a driver is in front of another car intentionally causes the collision. The driver in front slams on the brakes, intending to either cause the driver behind to hit them, or in hopes of scaring the driver behind and forcing them to take emergency evasive action to avoid a collision. Sometimes it’s road rage. Sometimes it’s an attempted insurance scam. Either way, it’s dangerous, it’s criminal in most jurisdictions, and it’s the clearest example of a rear-end collision that is not the fault of the driver behind.

At Ready Law, we have seen an increase in actual brake-checking, and an increase in rear-end collisions where the at-fault driver behind caused the collision, but later claims they were brake-checked or even that the driver in front backed into them. These attempts to avoid accountability for causing a rear-end collision are just as fraudulent as the insurance scams described above.

A sudden, arbitrary stop

This one is trickier. Imagine you’re driving on a clear stretch of highway behind another car, no traffic ahead, no animals in the road, no reason at all to hit the brakes, and the car in front of you…just stops. There’s no intent to cause a collision like there is with brake checking, but the stop itself was unreasonable.

Cases like this usually come down to two questions:

• Why did the front driver stop when there was no reason to? (Bonus question: And can that be proven?)
• Why did the rear driver not leave enough room to stop safely?

Both drivers may share some responsibility, and we’ll talk more about comparative negligence in situations like this below.

Chain reaction crashes

A really common scenario is our third example. Chain reaction collisions happen frequently. Several vehicles are stopped at a red light, someone fails to safely stop at the back of the line, and suddenly there are three or four cars that have been pushed into the cars in front of them. On paper, it looks messy, since car #2 couldn’t control being pushed into car #1 if car #4 hit car #3 and so on.

In practice, the driver who caused the first impact usually ends up responsible for the whole chain. In this scenario, everyone who safely stopped likely drove their vehicle in a reasonable way, and any negligence claim against any of them will be based on whether and how their own actions were unreasonable. It is very hard to argue that the middle drivers should have somehow anticipated getting shoved into the car ahead of them.

Comparative negligence in Colorado

Colorado is a comparative negligence state, which means fault can be divided between drivers. If a jury decides one driver was 60 percent responsible and the other was 40 percent responsible, the recovery can be adjusted accordingly. An additional nuance is that the defendant needs to be found to be 51% liable for there to be any recovery at all.

Here’s the part most people don’t realize: insurance companies sometimes apply this on their own, and sometimes they even do that quietly. We have seen auto insurance carriers assign a percentage of fault to our clients who did nothing wrong at all. Zero percent negligent, but the carrier decides to shave 10 or 20 percent off the payout anyway, and they do not always communicate that right away, or without being asked. It’s self-serving math, and it works because most people don’t know it’s happening if they’re handling their claim on their own. This is just one of many reasons it pays to dig into any offer made by and insurance company to settle a claim. What is the offer based on? What portion of the offer is intended to cover which losses?

If your settlement offer feels lower than it should, this may be the reason. It’s worth asking, and it’s almost always worth pushing back.

We’ll talk more about comparative negligence in Colorado in the future, and you can check back here or follow our YouTube channel, @ready-law, for more.

The real standard: Reasonableness

Underneath every rear-end collision case, no matter how simple or complicated, is one question: was each driver acting reasonably? For example:

• Did the driver behind leave enough room for the speed and the conditions?
• Did the driver in front do anything unreasonable that contributed to the crash?
• Would a reasonable person, in the same situation, have done something different?

Juries decide these questions using that standard. Insurance adjusters are supposed to make the same assessment in the background of every claim they evaluate. That’s why cases with unusual facts, like an arbitrary stop or a chain reaction, don’t always resolve exactly the way you’d expect.

Why this matters for your claim

A rear-end collision may look like the most straight-forward insurance claim in the world. Sometimes it is. But rear-end collisions can cover a range of situations, and insurance companies know how to take advantage of gray areas to reduce what they pay.

If you’ve been hit from behind and something about your claim feels off, whether it’s a low offer, a partial fault finding, or an adjuster who won’t explain their math, that’s usually a sign it’s time to talk to a lawyer who handles these cases every day. Similarly, a personal injury lawyer can help people who find themselves in one of the rear-end collision exception examples we covered above.

At Ready Law, we help people in the Denver metro area and throughout Colorado work through exactly these questions. If you have been injured in a rear-end collision, reach out. We’d be glad to talk it through with you.

Get Ready.