If you've ever wondered, here's a report compiled by TomTom that ranks European cities' traffic patterns, based on the difference between peak commuting hours and the mid-day lull. Not surprisingly, Moscow has the worst traffic, and anyone who's ever driven the Paris Perpherique or Brussels ring won't be shocked by those cities' relatively high rankings (7th and 9th, respectively). More curious, though, are Warsaw and Stockholm's high ranks, and London's relatively low rank at 14- still high overall, but I would expect a city of London's size and economic importance to suffer under more traffic strain than, for instance, a relatively secondary city like Palermo or Lyon. And no surprises here in Germany, Stuttgart has the worst traffic in the country.
So... what do you think?