[nostrademons]

If people are walking or taking public transit anyway, you don't have a vehicle problem in the first place.

[throwaway50606]

Oh, we most certainly do. Look at how much energy in the form of gas/diesel is used in Europe - it's definitely not insignificant. The average household has almost 2 cars, many have 3 - and they use them, just not to get to work.

IMHO the usage patterns and the population density make this a much harder problem here than in the US.