The idea is going into the right direction but i would also love to see a skyrocketing price for a second car per household. So if i need a car and my wife as well, i would encourage to make the second car around four times as expensive. Also I don't like the weight and size that much cause a functional vehicle like a minivan or pickups or vans used for work reasons shouldn't be punished. A combination out of HP, weight and a functionality factor (roomy family friendly cars and pure or mainly used working vehicles vs big luxury SUVs or small overpowered sports cars) would be a adequate calculation. Also motorbikes would need an adjustment in that level. Nobody can tell me they need a 120hs motorbike for a proper commute. They are just noise pollution.