Was the area where you had the accident fairly well developed? If there were businesses along the street they may have security footage of their parking lot and the street in front of it, and many people are having "Ring" doorbell cameras installed which would also cover the street in front of their homes. It might be worth going to the homes and businesses close to where the accident occurred to see if they didn't happen to capture footage of it.
I also roll with a dash cam.
I also roll with a dash cam.