Because drivers are generally not trained to see us and because we are narrower than most other road objects, drivers truly can miss us. Vision acts in weird ways, and when you sweep your eyes or head, you think you're seeing all the things in between, but you might not be. Lights mitigate this risk a small amount but do not compensate for it entirely. I also run lights day and night. It might help, and it can't hurt unless it blinds drivers, and I'm careful to aim them well so I'm not worried about blinding people. It would be a mistake to say, "I'm running lights so there's no way anyone will miss me."