The Natural Philosopher muttered:

Legislation is
oppressive, and taxation will only ultimately work if its *directly*
coupled to fossil energy usage, and the gratuitous consumption of raw
materials in short supply.

One of the experts on Radio 4 yesterday said that the change required was
similar to that in WW2, i.e. massive.

A poster on the BBC HYS forum had quite an interesting idea in that every
driver would be rationed with a fuel allowance, say 500 litres of fuel per
month, if a driver stuck to his allowance, fine. If he exceeded it, he'd
have to buy his extra ration from people who'd not used up theirs.

The only time I noticed a distinct drop in traffic volumes in London was the
week of the petrol strike in 2001, London was almost a pleasant place to be.