78 kilos is a reasonable weight for a driver of a light car. But you make a fair point. Overweight people should be sensible and buy cars capable of carrying their weight, just as they should be weighed before they get on an aircraft and be charged accordingly. Anyone over 90 kilos travelling economy class should be treated as excess weight and the excess should be subtracted from their baggage allowance. No one morbidly obese should be allowed to sit in an economy class aircraft seat where their flesh encroaches on the next passenger and can inflict DVT. Fat Donalds has a lot to answer for.