Is driving with the windows down bad for you? Does it save gas? Should you keep your windows closed or open when you drive? Here’s what the science says.
It’s a peaceful early morning around 4:45 AM. Most people are still asleep. You practically have the highway to yourself, moving at a leisurely 55 MPH with the windows down…It seems silly to run the car air conditioner on such a beautiful day. Why would you waste the gas?
But is driving with the windows open bad for hearing?
What science says about driving with the windows down
Don’t believe it’s that loud? British scientists tested everything from a Mazda to an Aston Martin in non-rush hour traffic going 50, 60, and 70 MPH.
They found that regardless of speed or model, when the windows were down, the driver was exposed to a nearly constant 89 decibels of noise.
You get it. Cars are loud. But is this enough to cause permanent hearing loss?
Yes, 85 decibels is enough to cause permanent damage over an 8-hour period. If you’re in heavy traffic, where you’re consistently being exposed to over 100 decibels, permanent damage occurs within 15 minutes.
What factors contribute to the noise when your windows are open?
Your car may seem that loud, but there are a lot of factors that can really increase the decibel noise.
Your engine and vehicle types
Gas engines work by producing a series of rapid explosions in the cylinders. In about 80% of gas-powered cars, engines produce about 85 decibels of sound.
The kind of car you have makes a difference.
Your car may be quieter if you have a hybrid, electric, or small 4-cylinder engine. On the other hand, Ferraris can produce over 100 decibels in first gear.
When you have your windows down, there’s nothing between you and the sound of the engine. In addition, the car vibrates as it moves, producing even more noise.
Wind resistance adds to the noise mix. The swoosh and whistling sounds of wind moving across your vehicle can significantly increase the noise level even if you have a quieter car.
A study performed by the Henry Ford Hospital Department of Otolaryngology found that cyclists are exposed to 85 decibels of wind resistance at just 15 miles per hour. However, if a cyclist gets up to 60 MPH, the sound is as loud as 120 decibels.
A car has even more wind resistance than a bicycle. So when asking, Is driving with the windows down bad for hearing? The answer is an emphatic “yes.”
Traffic is louder than you think
The sound is magnified every time another vehicle passes you, even on a 4-lane highway. Not only do you hear the engine of the other car, but you also hear their wind resistance.
Noise is worst in these cities.
Try this. Ask your passenger to use a sound meter app on their smartphone while you drive to see how loud it is in your car. Of course, sound is always louder on the driver’s side because you’re closest to oncoming traffic, so keep that in mind while tracking decibels.
The sound meter will show the sound level spikes each time a vehicle passes. Semis and loud motorcycles are among the worst.
A passing vehicle can expose you momentarily to over 100 decibels of sound.
Don’t turn the radio up above the window noise
If you try to turn your radio up so you can hear it over street sounds, then your radio has to be louder than the street. That means the radio may be at 90-100 decibels.
The Doppler effect happens when something loud is compressing its own sound waves. It’s moving faster than they can. This changes the frequency of the sound you hear.
That’s why you hear a vrooooom sound that seems to change as the car driver gets closer and then moves on past you.
The sound coming out of the car is the same. But the sound waves got compressed.
Very high and very low-frequency sounds can damage your hearing at a lower sound volume. The Doppler effect amplifies sound. It takes sound to its frequency extremes, which is even louder when your windows are open.
Does driving with the windows open save gas?
The short answer is no. Here’s why.
Many people leave the windows down because they think it’s the smart thing to do and that it will save gas. They’re not asking, is driving with the windows down bad for hearing? Instead, they’re often thinking about the practical aspect of things.
They’ve heard that the car air conditioner uses up your gas.
The car AC indeed uses gas. But does it use more gas than the drag caused by rolling the windows down?
The Mythbusters, a popular TV program on the Discovery Channel a few years back, disproved this myth.
They put precisely 5 gallons of gas into two identical SUVs. Then they drove the vehicles at a consistent 45 MPH until both tanks ran out of gas. The SUV with the AC on with the windows up got an extra 15 miles on that 5 gallons of gas.
That’s the equivalent to saving a whole gallon of gas. Wow. Driving with the windows down also wastes a lot of gas. If you do this all the time, you may be wasting 3-4 gallons of gas out of every tank.
The other main reason people drive with their windows down is that it makes them feel young and alive, especially if there’s a great song on the radio. Some people even have convertibles to experience this feeling.
While it’s important to do things you love to do without the weight of fear, it’s essential to understand the risks and reduce them as much as possible.
Let’s look at how to do that next.
How to reduce hearing loss risk while driving
If you love to drive with the windows down or top off, there are some steps you can take to reduce your risk of hearing loss.
If you’re on a long road trip, take regular breaks and alternate between windows up, windows down. Even if it’s far from an 8-hour trip, it’s a smart preventive measure to give your ears a break.
If you have a convertible, rolling the windows up with the top down is enough to get sound below damaging levels.
Get a sound meter app on your smartphone to find out how loud it is in regular traffic. (Never use your phone while driving. Ask a passenger to help.)
Keep the windows up in heavy, moving traffic to avoid prolonged exposure to sound over 100 decibels. Remember, 15 minutes is all it takes to damage your ears when the noise is that loud.
Never try to drown out noise with music. It’s much louder than you think. Wearing headphones or earbuds while driving isn’t just dangerous for you, passengers, and other drivers. It also amplifies the damage caused by drowning out the noise with music by turning it up.
You face the same risks if you’re riding a motorcycle or even a bicycle in traffic. Get a helmet designed to reduce traffic sounds.
Get your hearing tested. If you’ve been driving with the windows down for most of your life, you’ve been very slowly giving yourself hearing loss. Sometimes it’s so gradual that we either don’t realize it or want to admit it.
Is driving with the windows down bad for your health?
The short answer is “yes”. When those windows are down, you’re exposed to engine noise, wind noise, other vehicles, and even your own radio trying to block it out. So take precautions and keep hearing at your best.