Kerb weight would be good which is now how it works in the UK. Yes fuel is massively more expensive but what about the detrimental effects on the car industry here. Most of the larger vehicles there are diesel, virtually all ML Class Mercs are diesel, diesel is cheaper than unleaded also.
How would owners of V8's here afford fuel and then the knock on effect as people started snapping up Excels, Festivas and maybe even a pink lada or two.
I am happy for it to come through cameras as long as it is done in the right way. Again difficult to Police. Snowy I think you have opened a can of worms here!