Definitely dark but as you can see, headlights would provide more than enough light for the shoulder areas to notice 1 or 2 vehicles, truck or car, vehicle light or dark, person on side of road etc., but yes it would be hard to give details like what person was wearing or partial plate or did vehicle have a flat. So if someone driving by wasn't chatting it up with a passenger, super tired, drunk or from out of town...they would notice for example, a person walking, a truck or LE vehicle and another car and would have shared this by now. I can tell you I witnessed 3 separate vehicles pulled over one day within 60 miles during the daytime and sure I could have maybe told you 8 hours later the colour of those cars but a week later, not a chance but yes I can tell between what exits the cars were pulled over. DNA is gonna be the key to this case as opposed to a witness I think.