Well, you can start by banning houses and cramming people into small apartments, which should be more efficient. Not everybody drives, but everybody needs a place to live and private houses are just abuse of the land.
Jokes aside, come see gas and parking prices in Europe.
I perfectly support house taxing being super-linear in the size of the house, if this is what you mean, in such a way that a decent house is as affordable as possible for everybody, and those who want very large houses recognize that they have an above-than-average share of a common resource, and therefore contribute to the common needs more than others.
That said, I believe that road space has different rules than housing space, so it is hard to compare them directly.
I am Italian and live in Belgium, in case this gives more strength to my argument. I also have a car and pay European prices for it. Of course, I try to use it as little as possible, which is good.
Probably not. FTR, I never said they should. I didn't propose any dependency on the number of residents, but this does not imply that I think there should be none. There are probably many other variables to take into account, and I didn't want to state a complete proposal. Just one of the many criteria.
Jokes aside, come see gas and parking prices in Europe.