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You might have some luck comparing with the Open Street Map, they have all the national routes on already I think....?
You might have some luck comparing with the Open Street Map, they have all the national routes on already I think....?
You can suggest edits to Google maps and add on cycle paths/cycling contraflow stuff. I've done a few, it's very easy.
I think http://www.google.co.uk/mapmaker is what you want.