“... speed was a factor”.
I know someone in law enforcement and this is what he told me. “Speed is a factor” simply because the car/vehicle was moving on impact. Let’s say you are driving 25 mph (in a 45 mph zone) and hit a tree. Speed is a factor because if the car wasn’t moving.. you wouldn’t have hit the tree. So, yes... typical cop speak.
The car veered off the road and overturned, probably wasn't doing 25 in a 45 zone. Sometimes it's pretty easy to tell when speed was a factor.