I think that's it. Also, it's easier to judge distances of larger objects; it's easier to tell the distance of a car with both headlights working than a car with one headlight working. A single blinky light doesn't give you a good sense of where a bicycle is. I wish there was a way to get two lights, far apart and side by side, without making it look like a car...
Have thought about velcro or zip tie a piece of PVC to the back of the rack. Could give lights some decent separation.
I have cars zip by in groups at 45-60mph. The sidewalks are lot safer but its not legal for 1/2 my route. Snow and ice will make for rough sidewalk travel so I'm practicing my road skills. Semi honked at me today.