Giving space, keeping space, paying constant attention to what's going on around you, tapping your brake lever multiple times before you stop (getting the light to flash) to ensure the cager behind you knows you're slowing down, and also considering where in the lane you ride (most of the time I tend to hug the center line or the side where I know traffic might be merging from.) Since you ride the same route everyday, you should have a pretty good idea as to what the traffic patterns and behavior are on those streets at that time of day.