Safe countries for touring (without having to take public trasport all the time) in EU?
Tricky question to answer.

Is London better because it has lots of official bike lanes, bike stop signs and bike crossings? But it also has a huge amount of traffic and lots of heavy trucks and busses in small streets.

Cambridge has little official support for bikes (it periodically bans them from areas of the city) but because there is relatively little traffic and a lot of bikes it's pretty good to cycle in.