Aside from all of the arguments above, several of which I agree with... several I don't, the narrow streets across Europe and most countries, aside from the U.S. of course, is the fact that the towns and roadways were laid out/built based on Pedestrians, Carts, Horse Drawn Carts/Carriages, etc... Over the centuries the only options city planners had were to build on what's available or demolish the buildings to widen the roads... not something that's cost effective and would have destroyed some of the most beautiful sites and architectural wonders. Even the crowded housing of major European cities are beautiful. In the U.S. we've had, and still have, an abundance of land available to build and a blank canvas to work with, therefore buildings were placed farther apart and roads were built wider... as such, vehicles are larger as well. Take New York for Example, the streets are wider than in European Cities, but narrower than many other cities built well after. And being a resident of the U.S. since birth, I grew up with wide streets but I've seen a trend over the past 40 years towards smaller vehicles and narrower streets. I don't think we'll get to European standards in my lifetime, or even my daughters for that matter, since there are still hundreds of thousands of acres to work with. We build them the way we do, because we have the room and when we have to widen streets, it's 10 times the costs. I know this is an old thread but wanted to add an additional viewpoint.