Passing a slow car (driving below the limit) on two lane undivided highway. You could pass them at the speed limit, but its safer to just speed up while passing the car and then reduce your speed when you are back in your lane.
I had to do this multiple times passing RVs while on a road trip this weekend.
It's legal, at least in the US, if there is a dotted or broken yellow line between the two lanes, the opposite lane is clear, and you have enough time/space to complete the overtaking before it swaps back to solid yellow. For obvious reasons, you generally want to spend as little time as possible in a lane that has traffic coming at you head-on.
Your opinion is asinine. If using the lane at that time/place to pass was not suitable it wouldn't be signed/marked for such. Increasing the time it takes for people to execute a pass is a regression in safety from the status quo.
Dunno how exactly these systems work, but I assume it wasn't designed by idiots who never driven a car before and accounts overtaking. Warning should be only ON when sustaining the speed, not for few seconds.
I had to do this multiple times passing RVs while on a road trip this weekend.