This is very instructive from Carlton Reid
http://www.roadswerenotbuiltforcars.com/stevenage/
Basically: Stevenage does have a good, well-designed cycle network at least as good as what was being implemented in the Netherlands in the 70s, yet cycling has fallen from about 14% commuting modal share in the 60s to the usual 3%-with-a-following-wind now.
The ECF's view is that it's because cars weren't restricted at the same time
I don't know Stevenage well enough to say one way or the other - but it did remind me that I was going to ask on here about what Livingston and East Kilbride are like & whether it's the same sort of situation. I was struck when talking to cyclists at Pedal for Scotland that the ones from both places couldn't actually think of anything they'd want to see improved locally, as they reckoned their network was already pretty complete and even well-maintained. But that may just be by British standards. Anyone here cycle there much? Any thoughts?