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Personally I think it's a good thing, why would you take a bike or public transport if driving is so easy to get from A to B? Stevenage is a perfect example of this as @skydancer pointed out.
If you remember the chaos of the Olympic where locals people finally start to feel like a second class citizen, the traffic was great, more people cycle (we sold a huge number of Bromptons at the time), lots of people walked.
Buses and tubes appear to be quite busy, but they're always over capacity anyway.
Ed's right. Red Ken destroyed the traffic flow in many parts of the city prior to the Congestion Charge. I lived in Bermondsey at the time and prior to Red's antics the traffic flowed smoothly and predictably, once he got his hands on the light sequencing, closed lots of back streets, made roads one way, it all went to pot pretty quickly