I was a daily bike commuter until retirement. Eternal vigilance helps. I had several "right hook" close calls involving an overtaking car turning to its right, through the bike lane, into a drive-thru of some kind. As is often the case, they don't see us & will turn right in front or into a hapless cyclist. The other dangerous scenario is when an oncoming car turns left in front of or into you, often at a 4=way stop, or illegally against a "no left turn" light. If the cyclist is just starting out, slow speed makes it hard to evade an accelerating car. Vigilance helps, but a bike in traffic is at the bottom of the food chain. Don