I found this great piece on strategy to stay safe while on your bike. Here is the short version of full version on Commute by Bike.
* Scan - Constantly scan the environment around you. If you focus on only one thing, like a pedestrian crossing the street, you may miss other hazards like the person getting ready to open their car door next to you.
* Identify - As you’re scanning, identify all the potential hazards. “Filter out the noise”, and identify what’s important. Don’t forget to identify potential problems approaching from the rear as well!