[sparker72678]

Once it goes beyond alerting, this is going to kill someone.

A driver will be on a 2-lane road (1 lane each way), and attempt to pass the driver in front of them. A car will be coming the other way, and they won't be able to get in front in time.

They'll try to slow and get back in, but the other cars will have filled the space. They'll have nowhere to go.

Perhaps in this example the driver shouldn't have tried to pass in the first place, but removing an "out" from this situation, in which everyone gets to go home to their families, is a horrible idea.

[taeric]

This scenario is terribly specified. If you don't have clear time to pass a car in front of you without going an absurd amount over the posted speed limit, you almost certainly are putting yourself in danger already? I'll go further and say that people that take excess speeds in this scenario are already causing more accidents today, than a limiter would cause in the future.

Edit: I should say I think it would be a bad idea to have the car force you to go slower than 1km over a limit. Having it visually alert that you are speeding, though, seems far more reasonable.

[frumper]

You're also going to be aware of this system when you attempt to pass another car. It isn't going to be installed in your car mid pass.

[VeninVidiaVicii]

I wholeheartedly disagree. When you’re passing someone on a two-lane highway you should always speed way up to get the hell out of the lane of oncoming traffic.

[imoverclocked]

It is poorly specified but also pretty common with the obvious variations. Eg: the person you are trying to pass, passive-aggressively speeds up.

[compton93]

Or when a car behind you tries to double dip on the overtake so you are forced to commit with them barreling up behind you.