Tag Archives: autosafety

Why You Should Never Leave Your Car After a Highway Crash

Why You Should Never Leave Your Car After a Highway Crash
Your car is the safest place to be after a high-speed collision. If it weren’t, you wouldn’t have survived the collision.

Crashes are frightening, even when we have time to anticipate them. They break our illusions of a world within our control and remind us–if we’re lucky enough to live through them–of just how vulnerable we are. Unfortunately, even with a fundamental knowledge of best practices in driver safety, it’s all-too-easy to find ourselves in situations where we make the wrong decisions under stress. Today we’re going to look at a tragic example of why you should (almost) never leave your car, minivan, SUV, or pickup truck after a highway collision.

Why shouldn’t you leave your vehicle after a highway collision?

Why You Should Never Leave Your Car After a Highway Crash
Stay away from undivided highways whenever possible.

Let’s say you were just in a crash. More specifically, let’s say you were driving down a two-lane undivided highway (a bad idea) at night (another bad idea) and speeding (yet another bad idea) in winter without winter tires (you get where this is going). Perhaps you’ve also been drinking (one more bad idea), since it was New Year’s Day (or any other holiday where drunk driving rates increase). And for good measure, let’s say you’re tired (which, just like every other risk factor above, impairs your judgment). At this point, it might be a miracle you’re still on the road and in your lane.

Let’s say you leave your lane.

And you drive into the path of another vehicle.

And before you have time to react (keep in mind how quickly you cover distance before you can react, and how much more distance you need for your brakes to bring you to a stop), you hit that vehicle in a head-on collision. Per Vision Zero, if that collision occurred at above 43 mph (which it almost certainly did, since undivided highways in the US typically have 55 mph+ speed limits), there’s a good chance, statistically, that someone’s going to die. And someone does. Out of you, the driver, and front-seat passenger in the other vehicle, the other driver dies immediately.

You, however, survive. You survive well enough (due to the design of your vehicle, perhaps) to open the door, conscious, and leave your vehicle. It’s in the middle of the road with the other vehicle, and you walk to the side of the road in the dark and try to orient yourself to what just happened. Maybe you start trying to figure out where your phone is so you can call for help. Maybe you’re just trying to catch your breath because you’re crying and in shock and freezing; it’s the middle of the night in January, after all.

All of a sudden, night turns into day–except it’s not daytime. It’s another car coming down the highway (also speeding, in all likelihood). At this point, you’re a pedestrian. Your odds of being hit by a vehicle and surviving drop from 95% at 20 mph to 5% at 40 mph.

The speed limit, once again, is at least 55 mph, and most people speed.

The driver doesn’t see you. The driver does see the vehicles in the middle of the road, but due to a combination of the aforementioned factors (speeding, darkness, inappropriate tires, fatigue) can’t stop in time, and swerves off the side of the road…

…right into you. And everything goes black. Forever.

If you don’t get far enough off the highway, you have a high chance of being killed by a passing vehicle

If this sounds like a nightmare, it’s because it is. But it also happened, as best as we can tell, somewhat like the dramatization above, on New Year’s Day in 2018. The town was Milton, the highway was 59, and the people involved were Kelsea  Ann Anderson, 23, and Tracy Ann Stolen, 34. Anderson  drove a 2011-era Jeep Grand Cherokee northbound somewhere around 3:30 AM when she left her lane and crashed into Stolen, who was southbound in a Chrysler Town & Country. Miguel C. Baladez, 26, a passenger in the van, survived the crash and was hospitalized in stable condition.

Anderson survived the crash, left the vehicle, stood by the gravel shoulder, and was soon hit by 30-year old Andrew Kuehne driving a GMC Acadia. Kuehne, who was driving to work, saw the crash, believed he could not stop in time, swerved to avoid it, and hit Anderson, who died after being taken to a hospital. Investigators have suggested Anderson had been drinking.

To increase your chances of survival after a high-speed crash, stay in your vehicle unless it’s on fire or sinking

Why You Should Never Leave Your Car After a Highway Crash
Your car is designed to protect you. Use it like your life depended on it.

Your odds of survival while ensconced in a multi-ton vehicle–even a damaged one–are far, far greater than your odds of survival on the side of the road if you’re about to be hit by another multi-ton vehicle at high speeds. While it goes against our instincts to get off the road or get away from the crash, I’d recommend remaining in your vehicle unless it presents an imminent danger to do so.

As this tragic story indicates, drivers are more likely to swerve off the road to avoid vehicles in the road than they are to hit said vehicles in the road. If you’re in a large, heavy target, other drivers will avoid you out of self-preservation, if for no other reason. If you’re a human-sized object on the side of the road and conditions are less than perfect–weather-wise or in terms of the mental states of the drivers approaching you–you’re at far greater odds of being hit than anything else.

Stay inside to stay alive.

Stay inside to stay alive. It’s short, it’s simple, and in most cases, it’s true. It’s even easier to do if your vehicle isn’t in the middle of the road after a crash or flat tire. Even if it is, however, it’s still going to be better than being just a few feet away from your vehicle. I’ve read too many cases of people surviving crashes, just as Anderson did, only to be killed by other drivers who directly hit them or who hit their vehicles–the vehicles that just saved their lives–driving their vehicles into them as they stood beside their vehicles.

Stay inside to stay alive.

Mike, why do you call these situations crashes or collisions instead of accidents?

Why You Should Never Leave Your Car After a Highway Crash
We don’t always get second chances when driving. Do your best to do it safely.

This is a question I get from time to time. The reason i refer to crashes as “collisions” or “crashes” is because in auto safety circles, they’re typically not referred to as accidents, because even though we almost never mean for them to occur, they’re almost always preventable. An accident implies that whatever event occurred did so due to an act of God. In reality, whatever event occurred typically did so due to a combination of factors, including speeding, alcohol consumption, a lack of seat belt use, a lack of attention, fatigue, cell phone use, a lack of winter tires, road rage, etc.

A full 50% of auto fatalities occur by people who simply run off the road into trees, bridges, barricades, telephone poles, walls, and other barriers. It’s a semantic difference in many respects, but it does help shift the locus of control back toward the individual and society (e.g., driving techniques, vehicle safety, road design) rather than toward fate, which, by definition, cannot be altered. There’s nothing to learn from when we decide that bad things happen purely due to chance; we need to take ownership of our roles as individuals and societies in creating road traffic that respects human life.

Read more about best practices in driving techniques, vehicle safety, and road design here

If you find my information on best practices in car and car seat safety helpful, you can buy my books here or do your shopping through this Amazon link. Canadians can shop here for Canadian purchases. Have a question or want to discuss best practices? Send me an email at carcrashdetective [at] gmail [dot] com.

Your Big Car, Truck, or SUV Will Not Protect You in a Highway Crash

If you’re sharing the road with a vehicle like this, it doesn’t matter whether what you’re driving weighs 2,000 or 5,000 pounds. You need to avoid it, or you’re going to die.

One of the most common and harmful myths of auto safety in the US is that large vehicles are necessary for safe driving, and that they provide much more protection than smaller vehicles. I’ve addressed this myth before in articles such as My Prius is safer than your large SUVs and even larger pickup, How small cars make us all safer, and more recently, in A Cruze is as safe as a Suburban and A CR-V is as safe a as a Pilot. Today we’re going to revisit the myth by comparing death rates of some of the latest small cars on the road to those of some of the latest and largest cars, minivans, SUVs, and pickup trucks money can buy. All of the data comes from the most recent IIHS status report with driver death rate data, Volume 52, No. 3.

Small cars with very low driver death rates, or the safest used small cars money can buy

2011-2014 Chevrolet Volt – 7 driver deaths (0-39)

I recently wrote about how the Volt achieved the lowest fatality rate ever for a small car in the IIHS’ driver death rate surveys. The estimate of 7 suggests that if 1 million drivers put our staggeringly high annual mileage of 13,476 on 1 million ’11-’14 Volts, only 7 of those drivers would have died at the end of a full year. That’s as good as it gets for a small car right now; the only cars that have scored better in estimates are a precious few mid-sized and large models. Due to its batteries and internal combustion engine, it weighs a porky 3,781 lbs.

2011-2014 Nissan Leaf  – 8 driver deaths (0-44)

In a statistical dead heat with the Volt is the Nissan Leaf, which achieved a driver death rate of 8, the lowest yet estimated by the IIHS for an electric vehicle and the second lowest fatality estimate ever made for a small car. As noted in that article, due to the overlapping confidence intervals, it’s entirely possible it shares the same true driver death rate with the Volt; it’s even possible that true driver death rate might be zero. Pretty impressive for a car that costs under $10,000 in the used market and will never, ever need gasoline. With its battery pack, it weighs roughly 3,375 lbs.

2011-2014 Mini Cooper Countryman 2WD – 10 driver deaths (0-53)

The Mini Countryman is yet another station-wagon styled small car that matched or bettered a bevy of much heavier and larger vehicles with its driver death rate of 10. The larger sibling of the venerable Mini Cooper (which did not appear on the death rate survey due to low sales), it’s also the first vehicle on this list to feature a fully internal combustion engine. It weighs a svelte 3,208 lbs.

2012-2014 Subaru Impreza 4WD Wagon – 12 driver deaths (3-36)

While the Outback is undoubtedly the most famous Subaru and  by far their most popular wagon, the little Impreza actually equaled it in driver safety with an identical driver death rate of 12. Not bad for a vehicle that costs several thousands less than its flagship mark sibling. And with overlapping confidence intervals, it’s just as safe as not only the Outback, but the Legacy and Forester too. It weighs around 3,241 lbs.

2012-2014 Fiat 500 – 13 driver deaths (0-26)

The tiny Fiat 500 is the smallest car on this list, yet it kept its drivers as safe any of the vehicles already mentioned, and several huge monsters we’ll review in a minute. It weighs a scant 2,533 lbs.

Now that we’ve looked at 5 small and light cars with exceptionally low driver death rates, let’s compare them to 5 cars, SUVs, minivans, and pickup trucks that weigh much more, yet didn’t provide any more protection to their drivers–to hundreds of thousands of them who drove around the United States under the same conditions and on the same roads.

Much larger vehicles can offer much worse protection (or at least no better)

2011-2014 Ford Taurus 2WD – 40 driver deaths (23-60)

Our token large car, the Ford Taurus, was the most popular large car sold in the US during the surveyed years for the driver death rate study. However, although the Taurus weighs roughly 4,224 lbs, it didn’t provide any more protection than vehicles weighing hundreds to thousands of pounds less. Despite the higher driver death rate, we can’t say the Taurus was less safe than any of the aforementioned vehicles, as its confidence intervals overlapped with all of them. What that does allow us to state, though, is that it did not offer any advantage whatsoever, statistically speaking, over any of those vehicles when it came to keeping its drivers alive.

2011-2014 Chevrolet Suburban 1500 4WD – 39 driver deaths (11-67)

I recently profiled the Suburban in a comparison article with the Cruze, where I showed how, despite it being a much larger and heavier vehicle, it didn’t provide any additional driver protection as measured by driver survival rates compared to the Cruze. As a result, it was a perfect candidate for the token large SUV in this article. Despite weighing a hefty 6,551 lbs on the high end, it didn’t protect its drivers any better than vehicles weighing  up to 4,000 pounds less.

2011-2014 Ford F-250 Crew Cab 4WD – 35 driver deaths (22-27)

The 4WD Crew Cab trim of the F-250 will be our token large pickup truck, as it was the most popular sold in the US during the driver death rate survey years. The high sales rate is reflected in its narrow confidence interval. However, despite weighing a formidable 6,940 lbs on the high end, it was no safer than vehicles weighing up to 4,400 pounds less.

How can so many big cars be no safer than tiny ones for my family?

There are a few things to keep in mind to help explain these findings. First of all, it’s essential to remember that the three factors in auto safety involve how we drive and where we drive in addition to what we drive. No matter what you’re driving, it’s only one third of the equation. And there isn’t a vehicle on the road today that can stop you from accelerating into a bridge column while drunk, or switching lanes into the path of a semi-trailer after falling asleep. The roads you choose, the speeds you use, the times you drive, the miles you log, the tires you install (or don’t), the car seats you buckle your children into (hint: do what the Swedes do!)…it all adds up to far more than the vehicles themselves.

Compared to a semi-truck, we’re all driving small, tiny cars, SUVs, minivans, and pickups

Compared to this truck, every passenger vehicle on the road is a tiny car. How and where we drive make far more of a difference than what we drive.
Compared to this truck, every passenger vehicle on the road is a tiny car. How and where we drive make far more of a difference than what we drive.

Beyond all of this, it’s essential to remember that no matter what you drive, if it’s a standard passenger vehicle, it’s massively outweighed by the many large trucks and buses that populate our highways. A semi-trailer can weigh up to 80,000 pounds. A dump truck can weigh more than 60,000 pounds. The roads are filled with these vehicles. It doesn’t matter whether you’re hit by a vehicle that weighs 10x more than yours (e.g., a 70,000 pound truck crashing into a 7,000 Ford Super Duty) or a vehicle that weighs 20x more than yours (e.g., the same 70,000 pound truck crashing into a 3,300 lb Subaru); once the mass differential exceeds around 1.5x and your speeds exceed around 50 mph, you’re probably going to die. And if you increase the speeds to what most people consider highway speeds (e.g., 65-85 mph), you’re going to die in a head-on collision with pretty much anything larger than a motorcycle.

We can’t protect ourselves with size and mass

The solutions lie in changing how and where we drive. Choose safe speeds, follow best practices with car seats,  and choose safe roads, and you can achieve a better family survival rate than that you’d get from choosing any passenger vehicle on this list, or on any other list.

If you find my information on best practices in car and car seat safety helpful, you can buy my books here or do your shopping through this Amazon link. Canadians can shop here for Canadian purchases. Have a question or want to discuss best practices? Send me an email at carcrashdetective [at] gmail [dot] com.

Do adults need to use seat belts in the back seat for safety? Yes!

The laws of physics don't stop in the front row.If all aren't restrained, all are at risk.
The laws of physics don’t stop in the front row.If all aren’t restrained, all are at risk.

Many adults who see themselves as safety-minded drivers often forget that the rules of physics apply equally when they drive and when they’re simply passengers in moving vehicles. Specifically, it’s easy to forget that you need to wear seat belts when you use taxis, Ubers, and Lyfts, or that children need to use car seats and seat belts even on short trips in your neighborhood. Today we’re going to look at why adults wear seat belts less frequently when they’re back seat passengers, which risks they pose to other occupants, and whether or not our laws are encouraging better habits or enabling poorer ones. Buckle up!

Most adults use seat belts, but are more likely to ride unbuckled in the back

It doesn't matter who or where you are. If you're in a car, you need to be buckled up. And so does everyone else.
It doesn’t matter who or where you are. If you’re in a car, you need to be buckled up. And so does everyone else.

As you might have guessed from the title of this article, there are a significant number of adults who aren’t wearing seat belts whenever they travel in vehicles. Observations of belt use in 2015 suggested 89% of drivers and front-seat passengers use seat belts (which is good, but still less than in a number of fellow wealthy countries in Europe and Asia). However, only 75% of adults who sat in the backs of vehicles were observed to use seat belts. In other words, in a car with 4-5 adults, on average, at least 1 will be unbelted. This is quite dangerous; we’ll go into why in a moment.

A 2016 IIHS phone survey revealed similar numbers; while 91% of adult respondents claimed to use seat belts every time they sat in the front row, only 72% stated they did the same whenever they sat in a rear row. The numbers are slightly different from the 2015 observation, but they’re close enough to be judged as equal. The key point is that while roughly 9 out of 10 adults will buckle up when driving or shotgunning, only 7 out of 10 will when sitting in the back.

What kinds of risks are they running?

Big ones. And not just for themselves, but for everyone unfortunate enough to ride with them.

One unbuckled passenger can spell death for everyone else in a vehicle

Per previous studies, unbelted back-seat passengers increase the risks of serious injury and death for front-row drivers and passengers, even if those occupants are wearing seat belts. Similarly, unbelted occupants–wherever they are–increase the risks of injury and death for adjacent belted occupants. It’s estimated that an unbelted occupant increases death risks for all vehicle occupants by 40 percent. And if you’re a belted driver with an unbelted passenger behind you, your risks of dying in a crash shoot up by 137 percent.

Why aren’t adults wearing seat belts in the back seats, and which adults are least likely to buckle up?

Per the IIHS telephone survey, 35 to 54 year-old adults were least likely to use seat belts when traveling in the back seat; their percentage of compliance was at 66 percent, significantly lower than the 73 percent of adults between 18 and 34 and 76 percent of age 55 and older adults. Beyond these demographics, men were less likely to use seat belts than women, as were less educated individuals (those without college educations).

On top of these results, the status of the vehicle made a huge difference: only 57 percent of rear-seat passengers in taxis, Ubers, limousines, and similar hired vehicles reported always using seat belts, while this number jumped to 74 percent of rear-seat passengers traveling in personal, non-hired vehicles. As I’ve noted earlier, it’s essential to use seat belts and car seats in taxis, and there are many taxi / Uber fatalities each year involving unbelted passengers. Perhaps the most famous of the last twenty years was Princess Diana. There are no second chances with death.

When asked to provide reasons for not using seat belts, the primary reason provided was a mistaken perception that rear seats were safer than front seats, rendering seat belts unnecessary. This, of course, is incorrect. Adults also responded that they didn’t have a habit of using seat belts, that they forgot to do so, or that they never or rarely used them. Some adults claimed they found seat belts uncomfortable, while a few said they could not find them when they wanted to use them. Overall, the majority of responses were either tied to safety ignorance or deliberate seat belt refusal.

Do our laws encourage best practices or enable irresponsibility?

If we’re asking this question in a country that’s been raising speed limits in state after state while most countries have been decreasing them, the answer’s not going to come as much of a surprise. While 49 of the 50 states require front-row seat belt use (New Hampshire does not), only 29 states do so for rear passengers. Federalism fails again! Much as each state gets to set its speed limits, all the way from reasonable (Hawaii at 60 mph) to super-crazy (parts of Texas at 85 mph) or each state gets to decide that 1 is good enough for rear-facing, each state gets to decide whether or not it’s necessary for back seat passengers to use seat belts, or whether the laws of physics only apply to front-seat occupants. This is also a factor in the wildly disparate rates of per capita fatalities across the US. Some states are simply safer than others. Of the 29 non-crazy states that believe all occupants in a moving vehicle should be somewhat restrained, only 20 of them use primary enforcement, or allow police to stop drivers for seat belt non-compliance. In the other 9, it’s a secondary offense, which means police need additional reasons to stop vehicles besides seat belt-related ones. Nationally, 30 states use primary enforcement while 18 rely on secondary enforcement.

Our laws are a reflection of our society’s values. We don’t really value seat belt use for adults. Considering that they reduce the odds of death by about 50% in a serious crash and we lose around 35,000 individuals a year in auto deaths with most of them traveling in passenger vehicles, it’s not hard to see how we’re leaving thousands of lives on the table–or rather, allowing thousands to end needlessly. Per the NHTSA, 13,941 lives were likely saved by seat belts in 2015, and 2,800 more could have been saved with full compliance.

If you find my information on best practices in car and car seat safety helpful, you can buy my books here or do your shopping through this Amazon link. Canadians can shop here for Canadian purchases. Have a question or want to discuss best practices? Send me an email at carcrashdetective [at] gmail [dot] com.

There is No Safe Amount of Alcohol You Can Drink Before Driving

Partying is fun. Drinking before driving is not. Even one drink before getting behind the wheel makes you more likely to kill yourself or someone else--long before you reach the legal limit.
Partying is fun. Drinking before driving is not. Even one drink before getting behind the wheel makes you more likely to kill yourself or someone else–long before you reach the legal limit.

One of the persistent myths related to alcohol and driving, particularly in the US, is that drinking before driving is okay as long as you take certain precautions. Some people believe those precautions are not drinking too much; others believe in eating certain foods or drinking certain things in addition to alcohol, or spacing out drinks or driving slowly or listening to loud music or splashing themselves with cold water or…the myths are endless.

The US and Canadian Limit of .08 g/dL is Already Too High

Just one drink is enough to make you a poorer driver. Would you bet your life--or that of a loved one--on those odds?
Just one drink is enough to make you a poorer driver. Would you bet your life–or that of a loved one–on those odds?

Unfortunately, none of them are true. There is no safe amount of alcohol you can drink before driving. My definition of “safe” involves an amount of wine, beer, champagne, whiskey, liquor, hard lemonade, or any other alcoholic beverage you could consume and remain as competent of a driver in the next several hours as you would have been had you not had that amount of alcohol. In the US, the law states you can consume up to .08 grams of alcohol per deciliter of blood (known as the Blood Alcohol Concentration, or BAC, as measured by g/dL) as long as you’re over 21. However, this limit is far too high, as evidenced by the fact that approximately 1/3rd of all fatal car crashes in the US are linked to alcohol, and have been so consistently since the 1970s.

Blood Alcohol Concentration Effects Below .08 g/dL – What happens before you’re legally drunk?

The .08 limit doesn’t work; by that point, you’re long past the point of being a safe driver. Let’s take a look at what alcohol does to your body and driving abilities before you reach .08 of alcohol concentration.

.02 – You’re going to lose your judgment to some degree. This might mean saying things you ordinarily wouldn’t or doing things you normally wouldn’t with people you normally wouldn’t. You might feel more relaxed, a bit warmer, and different in your mood. To a typical person, you might appear more talkative, happier, giddy, or simply less likely to say no. Your concentration’s going to go down. That means you’re more likely to miss things–like whether that light was green or red, or whether that’s a 2-way or a 4-way stop, or whether or not a child just ran out in front of your car.

.04 – Everything above will be happening in earnest. You’re going to start exaggerating your movements, which makes sense because you’re going to have more and more trouble controlling your muscles, especially the fine ones. That might mean having trouble focusing your eyes or holding objects between your fingers. Your judgment will continue to drop, but you’re not going to notice it. That might mean going home with people you wouldn’t–which you’re going to feel good about. You’ll be less inhibited, after all, and less alert. This means your driving’s going to get worse–a lot worse. Things will get harder to track. The steering wheel will get harder to steer. Your braking will take longer. This is the point where people might start suggesting you don’t drive, if you’re lucky.

.06 – Everything above will be happening more and more quickly, and you’ll be responding more and more slowly. Your focus will continue to drop, as will your ability to discern bad ideas from good ones. You’re going to have a lot of trouble remaining faithful–whether to your values or to the people you love. And if you get behind the wheel, you’re going to have trouble staying between lanes, staying within any kind of a speed limit, staying away from moving cars, moving people, sidewalks, and police cars. In short, you’re going to be drunk. However, it’s important to remember that you were already drunk; it’s just going to be more obvious to everyone but you.

By the time you hit the legal limit, you’re already long drunk

None of these levels are against the law in the United States or Canada as long as you’re over 21. But if you’re reading this article while sober, it’s hopefully apparent that none of these levels of inebriation would be remotely safe on the roads. Or to put it more bluntly, if you wouldn’t want to be walking across a crosswalk with your spouse and children while someone barreling down the road with the physical and neurological effects described above, you intuitively understand why those limits, while legal, are unacceptably high.

If a .08 BAC is already far too high to be safe, why is it legal in the United States?

US drinking limits are higher than those almost anywhere else in Europe. Why is that? (Credit: Wikipedia)
US drinking limits are higher than those almost anywhere else in Europe. Why is that? (Credit: Wikipedia)

As is almost always the case when injustice and inequality exist on Earth, it comes down to money. If you visit the NHTSA’s page on drunk driving, you’ll find all sorts of information on the effects of alcohol at .08 BAC and below and statistics on the dangers of drinking and driving. However, what you won’t find is any meaningful advocacy or discussion about lowering the alcoholic limits, or references to how the limits are lower in nearly every other rich country on the planet, and how those countries suffer significantly lower rates of drunk driving (or drink driving, as it’s largely known outside the United States). Look at the map above of European BACs. Why would the US stand out so much?

There’s an awful lot of money tied up in encouraging and distributing alcohol in the US. Companies like Anheuser-Busch InBev SA/NV (who produce brands like Budweiser, Corona, and Stella Artois) make 45 billion dollars in revenue in the United States every year, and want alcohol in every home and on every occasion. And until we reduce the influence corporations have on our national policies, we’re going to continue to have lots of things that kill lots of people available in lots of places with minimal oversight–including, but not limited to guns, drugs, medication, giant cars, and alcohol.

If you find my information on best practices in car and car seat safety helpful, you can buy my books here or do your shopping through this Amazon link. Canadians can shop here for Canadian purchases. Have a question or want to discuss best practices? Send me an email at carcrashdetective [at] gmail [dot] com.

Is 4WD Really Safer than 2WD? Not Per IIHS Driver Death Rates

4WD doesn't offer any survival advantages whatsoever over 2WD when it comes to the all-important goal of keeping your family alive between Point A and Point B. Focus on how and where you drive instead.
4WD doesn’t offer any survival advantages whatsoever over 2WD when it comes to the all-important goal of keeping your family alive between Point A and Point B. Focus on how and where you drive instead.

One of the most persistent myths about driving in the United States is that four-wheel drive vehicles (4WD) are safer than two-wheel drive (2WD) equivalents. It doesn’t matter whether the vehicles involved are SUVs, crossovers, cars, minivans, pickup trucks, or station wagons–if they’re 4WD, they’ve got to be safer, because four powered wheels means more control, which ultimately means a safer way of getting your loved ones home, right?

Not right.

As with many other elements of best practices, what’s commonly done isn’t necessarily what’s safest. Today we’re going to look at IIHS driver death rate data and review how, in the majority of cases, having 4WD in a vehicle doesn’t make it any more likely to keep you alive than using the same vehicle (or even the same kind of vehicle) in 2WD. The goal here isn’t to make you give up your 4WD SUV; it’s simply to show that it’s not inherently safer than its 2WD equivalent, and that it doesn’t give you any leeway whatsoever with respect to the other two pillars of driving safetyhow you drive and where you drive.

Do 4WD SUVs/cars/minivans/pickup trucks have lower driver fatality rates than 2WD vehicles? If not, why not?

No, there isn’t a significant difference in driver death rates between 4WD and 2WD vehicles; this has been shown for years in IIHS driver death rate studies, although the IIHS once erroneously thought that 4WD was safer (see Status Report Volume 46, No. 5, when they split death rate reports by vehicle drive type). They realized their error by the following death-rate-focused status report (Vol. 50, No. 1) and got rid of what was a meaningless way of dividing the data. Let’s look at the most recent survey, Volume 52, No. 3. What follows are various models of minivans, SUVs, cars, and pickup trucks where driver death rate data was available for both 4WD and 2WD trims, as well as confidence intervals in parentheses.

2011-14 Toyota Sienna
4WD
– 10 (1-37), 2WD – 9 (2-16).

I wrote specifically about the Sienna when comparing it to the Odyssey here. The 4WD and 2WD driver death rates were statistically identical, as the confidence intervals overlapped between both trims. Both were also statistically indistinguishable from the 2WD Odyssey.

2011-14 Honda Pilot
4WD – 15 (5-25), 2WD – 17 (3-32).

I recently wrote about the Pilot in the context of how neither the 4WD nor 2WD trim had any statistical safety advantages over the 4WD or 2WD trims of the much smaller Honda CR-V. As noted in that article, both trims of the Pilot were also indistinguishable from each other based on driver death rates.

2011-14 Mercedes-Benz E-Class sedan
4WD – 5 (0-26), 2WD – 4 (0-22).

Not many cars outside the luxury market are sold in large numbers in 4WD and 2WD trims; fortunately, the E-Class is a perennial best seller and had enough sales to show, once again, that the 4WD and 2WD trims were statistically identical from a driver survivability perspective. Even the confidence intervals were nearly identical. To put it simply, if you crashed an E-class, it wasn’t because you were in a 4WD or 2WD.

2011-14 Ford F-150 SuperCrew
4WD – 24 (17-31), 2WD – 22 (10-34).

Finally, our token pickup, the F-150, showed again that driver survivability had nothing to do with whether the transmission was 4WD or 2WD. The confidence intervals overlapped again, as they did in all of the examples above, showing that, from a mathematical standpoint, there was no difference in the safety of either trim.

Why aren’t there safety differences between 4WD and 2WD?

The reasons why there aren’t safety differences is because there aren’t any special powers inherent in 4WD transmissions. They’re simply transmissions where all four wheels are powered instead of the front or back two. Once a vehicle is in motion, all four wheels are in motion, powered or not. A 4WD system doesn’t help you steer more accurately or stop more quickly; your steering has to do with the overall geometry of your vehicle, your speed, and the quality of your tires. Your stopping power involves many things (to be discussed below), but none of them have to do with whether you’re driving a 4WD transmission or a 2WD transmission. And as I’ve said many times before, the lion’s share of how safely you drive doesn’t involve what you’re driving, but how and where.

But what about winter driving? Isn’t 4WD safer on snow and ice?

No, it isn’t. The sole advantage of 4WD is, when paired with suitable tires, an increased ability to extricate the vehicle from low-traction situations. This means an improved ability to get moving in mud, slush, snow, and similar wet/dry situations. 4WD will not help you stop any sooner than 2WD in a vehicle matched by road conditions, speed, mass, tire size and tread, and brake quality. Every 4-wheeled vehicle on the road already has 4-wheel braking, and ABS will already do more to stop you than you ever could. Similarly, 4WD will not help you steer; every 4-wheeled vehicle already has 2-wheel steering, and ESC will do more to keep you heading in your intended direction than anything you could ever imagine; that’s what makes it life-saving technology.

What does make a difference for snow / winter driving safety?

Winter tires! They’re specifically designed to work through snow and cold conditions, and this is why a 2WD vehicle with winter tires will almost always be a better choice (as in, 99.9% of the time) than the same vehicle (or nearly any vehicle) in a 4WD configuration and all-season tires. On top of this, avoiding driving through snow, limiting driving when avoiding it is impossible, and driving as slowly as safely possible are the best techniques to get you through winter conditions, independent of vehicle and tire choice.

What about driving through or over ice? What’s the safest vehicle for ice?

Finally, when it comes to ice, there isn’t a safe vehicle out there that doesn’t use caterpillar tracks, and those kinds of vehicles aren’t street legal. Practically speaking, both 4WD and 2WD are equally helpless (or equally capable, if you’re optimistic); ice results in a loss to complete absence of traction, depending on the quality of the ice. The only way to counteract this actively is through studded tires, which are either restricted or banned throughout the United States. Winter tires will be better than all-season tires, but even they won’t provide dry-road equivalent traction on ice. Avoiding it, followed by driving as slowly as possible through it on winter tires, are your best options if you don’t have studded tires. 4WD won’t make any difference for stopping or steering through it.

Does this mean I should never buy a 4WD vehicle again for safety?

No and yes. If you live somewhere with more than 100 inches of snow a year or where the streets may not be plowed for several days or you have a job that doesn’t allow you to take personal days due to unsafe weather, then you might want a 4WD vehicle in addition to winter tires to increase your odds of not getting stuck on the way to or from work (or wherever you need to drive during or after heavy snowfall). However, this describes around 5% of the US population, and that’s being very, very generous. For the vast majority of people, 2WD paired with winter tires will help you handle any part of winter when paired with good judgment.

If you find my information on best practices in car and car seat safety helpful, you can buy my books here or do your shopping through this Amazon link. Canadians can shop here for Canadian purchases. Have a question or want to discuss best practices? Send me an email at carcrashdetective [at] gmail [dot] com.