The entry below reminded me... I am a member of Sustrans is the UK's leading sustainable transport charity. I joined last year but seem not to have mentioned them on my blog before...
What do they do... here are two passages taken from their web pages Why Sustrans?
"Cycling and particularly walking are the most sustainable ways of travelling. They require very little use of the planet's resources, and they are both fuelled by food, a renewable source of energy."
"So Sustrans has set about creating an environment that will actually help people to walk and cycle much more. Hence the National Cycle Network offering a mixture of traffic-calmed streets, quiet roads and traffic-free routes in communities all over the UK, helping people to work, shops, school and play."