Drivers have vastly different reflexes and visual acuity.

I have been running for 25+ years and have on occasion been traveling at close to 10 mph and usually at least 8 mph. So California rolls are pretty much the bane of my existence.

This is primarily because the "roller" may be planning to take a right turn and are looking straight and glancing left and don't even look my way traveling from their right.

I do take responsibility for my own survival so I wear lights, and try my best to make eye contact before entering intersections etc. but I have had many close calls where they did not even see me due to their own target fixation.

Now that I am on a bike more often I feel even more insecure because my speed is so much higher.