Most drivers adjust their mirrors incorrectly. The correct answer might be surprising.

Take a look at the four side mirrors above. Each shows a different setup: A shows a large part of the car’s own door, B shows even more, C shows a thin strip of the car, and D shows no part of the car at all, only the road and the lanes beside you.

So which one is adjusted correctly?

The answer: D.

If you picked A, B, or C, you are in good company. Most drivers were taught to set their side mirrors so that they can see a bit of their own car. It feels natural, because it gives you a reference point. But that habit has a serious downside.