Limit it to 130 km/h, which is appropriate for almost all or Europe[1]. If you're e.g. in Germany or Poland, you can have it unlocked, but the car stops being road legal anywhere else.

Ideally, they'd just harmonize the speed limit in the EU; a majority in Germany approves of introducing a general speed limit on motorways anyways. But that'd hurt the bottom line of car manufacturers and we can't have that.

Also, GPS-validated speed limits for new cars. And I don't mean just the top speed in a country, I mean the posted speed limit on whatever road you are. Doesn't need to be a hard limit, in case of emergencies and for maneuvering, but make something interesting happen: online registration, enable the hazard lights, I'm sure there are many good options. It's ridiculous we're talking about fully automated driving and we don't even have this simple automation which would get rid of an entire class of everyday offense.

[1] https://de.wikipedia.org/wiki/Datei:Freeway_speed_limits_eur...