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.

Ok, but legally you aren't allowed to do that.

Also why is it safer?

To me a predictable speed would be safer.

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.

>Also why is it safer?

Because you spend less time and less distance in the "wrong" lane.

Which you should not have entered in the first place.

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.

Safety when overtaking. Wife in labor.

Just call an ambulance (we are speaking about Europe here).

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.

Driving someone sick/injured to hospital from a rural area.

I'll name one: being significantly different from the speed of surrounding cars irrespective of speed limits results in more accidents.

Differential speed kills.

Avoiding a collision

Operating an emergency vehicle

No.

1. it's fun 2. also speed limits are stupid