From the cab - a HGV drivers view

The problem being that all bicycles would then need to be licensed in order to enforce the CBT, which is gunna cause a whole lot of fun for everyone. Have any other countries done this?

Any compulsory licensing or tests is likely to lead to a decrease in take-up of cycling. Agreed that training, especially for adults who have never cycled, is desirable but if the desired effect is to increase numbers of cyclists, then I have to agree with Weslito.