# Is It Really Safer to Fly Than Drive? How Do We Measure This?

• pellman
In summary, statistically speaking, it is safer to fly commercial airlines than to drive. However, this measure is not very meaningful because it does not take into account the probability of different types of accidents.
pellman
We have often heard that, statistically speaking, it is safer to fly commercial airlines than to drive. How would one measure this? How is it measured actually and is it meaningful? And if anyone has link to the actual numbers, that would be great.

This is my stab at it. Pick a sample period of time. Calculate the total number of hours flown, that is, the total time spent in the air by all people. (100 people on a 1 hour flight would contribute 100 hours to the total.) Actually, since accidents occur on the runway too, that should be time spent aboard a commercial plane, not just in the air.

Now do the same calculation for total time spent in autos. Then divide each by the total number of fatalities in airplanes/cars during that time period. If S_F is the time-sum for flying, N_F the number of fatalities, and S_D and N_D the corresponding numbers for driving, then

$$\frac{\frac{N_F}{S_F}}{\frac{N_D}{S_D}}$$

would be a ratio of your chance of being killed in an airplane per unit time vs your chance of being killed in a car crash per unit time. It has to either be per-time or per-mile to reflect that you have more of a chance of getting killed the longer your voyage, but perhaps per-mile is better. That way you can compare: what is safer? Driving from NY to LA, or flying from NY to LA?

So (1) am I right? and (2) is there a better way to do this?

You could do it for time (fatalities per passenger hour flown) or for distances (fatalities per passenger km/mile flown) or journeys (fatalities per passenger flight).

Distance tends to make planes look safer, since flying 10,000km over open ocean is fairly safe compared to making 1000 x 10km local drives, same for time.
If you want to make planes look dangerous compare accidents per km driven vs accidents/km of a plane on a runway!

Yeah and a meteorite is the most dangerous of all, because statistically the chance of getting killed by a meteorite is bigger than that of getting killed in a plane crash.

[Assuming a small probability for a meteor impact, but a huge fatality number, of course].
Which just goes to show that such "popularized" statistics (and indeed, any statistics, if one is not very careful) can be manipulated to support any conclusion you like.

## 1. Is flying really safer than driving?

Yes, statistically, flying is much safer than driving. According to the National Safety Council, the odds of dying in a motor vehicle accident are 1 in 102, while the odds of dying in a plane crash are 1 in 205,552.

## 2. Why is flying considered safer than driving?

There are several reasons why flying is considered safer than driving. First, airplanes are equipped with advanced technology and safety features that are constantly monitored and maintained. Second, pilots undergo rigorous training and are highly skilled at navigating and avoiding potential hazards. Finally, air traffic control closely monitors flights to ensure safe and efficient travel.

## 3. What are the most common causes of plane crashes?

The most common causes of plane crashes include pilot error, mechanical failure, and weather conditions. However, these incidents are rare and often preventable through proper maintenance and training.

## 4. Are smaller planes less safe than commercial airplanes?

Generally, smaller planes are considered less safe than commercial airplanes due to their size and lack of advanced technology. However, smaller planes also have lower traffic and are often used for shorter flights, which can decrease the likelihood of accidents.

## 5. Are there any precautions I should take while flying to ensure my safety?

While flying is generally safe, there are some precautions you can take to ensure your safety. Make sure to pay attention to safety instructions and follow all guidelines, such as wearing a seatbelt and stowing your belongings properly. Also, try to choose reputable airlines and check the safety records of the planes you will be flying on.

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