'Stopping' to provide video or being a witness is probably something I won't do unless it's a very serious accident, involving injury, death, or significant damage. or a hit and run. I saw one fatality wreck and provided video to the cops on the scene. Never heard back from them. On two separate, somewhat serious wrecks that I had decent footage of, it wasn't really feasible for me to stop in that location, but I stopped within an hour, checked the footage, saved it,and contacted the appropriate police department. Never heard back from them, either. Nothing is permanently adjudicated on the roadside by the cop. Charges can be laid later,dropped, or changed.
(Like we saw in that Canadian video where the cam car was initially ticketed, and 'witnesses' claimed it ran a red light, but the video proved otherwise.) Yeah, it's a pain in the ..... In the fatality accident I was involved in, years ago, (not my fault), the young investigating trooper initially stated I was somewhat at fault. When his 25 page accident report was reviewed by an experienced accident investigator......things were totally reversed.