Simplest explanation - because a car can be taken on a private road(off road track, racing circuit) and driven as fast as you like. Yeah, you are not going to do that in a prius, but theoretically, you could.
All new cars in EU have to be limited to 155mph by law, but manufacturers are allowed to remove that restriction if you complete an advanced training course. So for example - mercedes will remove the speed limiter on your AMG vehicle, if you finish their advanced amg handling course.
> All new cars in EU have to be limited to 155mph by law
Can you give a source for that? To my knowledge the 155mph limit is just an informal agreement between BMW, Merc and Audi, and not law. The agreement also expired a decade ago.
I am fairly sure that you can just buy an RS6 or an AMG Mercedes with 190mph top speed, no courses required.
Well, I bought an new AMG vehicle 3 months ago, so I happen to know that the only way to remove the limiter is to attend one of the AMG training courses. I imagine if you greased enough elbows you would get the limiter removed without doing the course, but there's certainly nothing you can do to order one from factory without the limiter.
And yes, I've done a bit of digging at it appears you are correct - it's not actually the law, just an agreement between manufacturers.
Edit: Ok, I've looked through technical specs of all AMG vehicles, and it looks like every AMG model from A to S class is limited to 155mph unless you do the course, but the AMG GT isn't. So....yeah, I'm just completely wrong on this. My apologies.
All new cars in EU have to be limited to 155mph by law, but manufacturers are allowed to remove that restriction if you complete an advanced training course. So for example - mercedes will remove the speed limiter on your AMG vehicle, if you finish their advanced amg handling course.