There are many more rules that just red, yellow green and the stop sign. It would be nice if the highway code was that simple though.
For example, how to navigate a busy multi-lane roundabout safely as a cyclist, such as Old Street roundabout in London, which looks like this: https://upload.wikimedia.org/wikipedia/commons/d/dc/Old_Stre..., or this roundabout in Bristol, UK: http://c8.alamy.com/comp/B2NMCH/aerial-view-looking-down-on-...