Well it's an interesting prospect, but in London myself I find that I prefer the opposite of what TFL's cycle routing thing thinks I would. I like main roads.

Well it's an interesting prospect, but in London myself I find that I prefer the opposite of what TFL's cycle routing thing thinks I would. I like main roads. Pedestrians tend to look before stepping out in main roads. They also have bus lanes. Bus drivers tend to be nicer to cyclists, they aren't in a hurry. Some things are fairly simple, avoiding right turns for instance, as often its much faster and safer to go on a bit further until some lights or roundabouts. Avoiding any road that is single car width, the amount of problems I find with drivers (despite me often doing in excess of the speed limits) rushing to overtake me, because i try to be courteous and let them at all times, only to then get stuck behind them due to oncoming traffic on single lane. So whilst I applaud their efforts, I'll be a bit cynical and suggest they are going about it the wrong way, it would be better to crowd source some scores for route sections aimed at specific kind of cyclists (many don't like doing 10mph+ because they will get sweaty) and somehow weave them together.