The author speaks in stepwise, risk management terms rather than "if green then go" rules. This is just another piece of information that can help you reduce ri

The author speaks in stepwise, risk management terms rather than "if green then go" rules. This is just another piece of information that can help you reduce risk and make better judgements as a cyclist on the road, but by no means a hard rule (don't think the author meant to imply that it is)