[dusted]

This is my concern as well, it becomes a weapons race towards the most idiot-sized vehicle possible, since a reasonably sized vehicle will put you at a survival disadvantage.

I live in Denmark, where this problem is yet very much in its infancy, but it's a clear trend. I hope regulation catches up. Some kind of bounding-box volume and weight restriction would be nice.

[Ekaros]

There is weight restriction, 3500 kg albeit that is too much already. I would go just with strict limit on energy consumption, fuel specific one. Effectively stop too large EVs too.