RIP to the fallen rider. For the last 7 months, I have been commuting 5 days a week. I know the danger out there on the roads. What do I do about it? I try to take the "oh I didn't see you" out of the equation. If you noticed I said I "try".. How do I do that? I run STRONG lights, night and day. Daytime, I got a strong front light on blinky, rear light, and sometimes a front and rear light on my helmet on blinky. That is during the daytime. I noticed that I am seen WAY MORE than when I don't run those lights. That was enough for me to start running them all the time. You should see how cars getting ready to turn in front of me NOW wait for me to pass.
IMO, we need every little safety edge we can get when we travel on the same roads that cars do. I have have several 100mph+ crashes on motorcycles (roadracing on racetrack), but nothing scares me more than the thought of a 3000+lbs of of moving steel hitting my frail body at speed on the street.
My commute puts me on roads where I have to take the full lane, and I move around in that lane to let others know, that I am taking the FULL LANE, and not half of it. That is a little trick I learned from eperience. No shoulder on the road, and I move to the right of the road, I get pass at 40mph+ in less than a foot. Now I zig zag in that lane, and no more of that close passing.
We never stop learning when riding on the street, never..
Again, RIP to the fallen rider.