I am annoyed by people who pull into the left lane and then stay there even when people are right on their tail, when there is nobody in front of them and the lane next to them is clear.
Because forcing people to pass on the right is dangerous
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Now while I too detest people driving slow in the fast lane, I wonder why someone would stay “right on their tail” when the lane next to them is clear? And if the right lane is clear - to use your example - then why is passing on the right “dangerous”?
I often use the “clear” right lane to breeze past a slow left lane driver. Why would you slow down and drive behind them, hoping they move over?
It’s more dangerous because you are driving faster, closer to the right lane where the really slow people are moving, and where people might be merging into the center lane to pass.
Worse, there’s a lot of people who drive on the left and just like to irritate others. You can see it because when the person behind them pulls to the right to pass, then the left-lane driver will immediately move into the center lane to block them.
But even those not paying attention, they won’t see you move over to pass, but they’ll notice the guy behind you who is now coming up quickly on their tail, and they will absent-mindedly move to the right, after a perfunctory check which won’t notice that in the next second you will be on their right in their blind spot.
The left side of your car is much easier to see than the right side. So it’s safer to pass people on their left, where they can see you, than on their right where it is easy to get caught by them changing lanes.