Not sure what happened here, relatively straight stretch of road at highway speed, couldn't see any flashing lights on the footage. People do not drive defensively, they tailgate, do not look any distance up the road, read the traffic etc.
Looked like those 3 cars where traveling waaaaaaaay too close together.
First car taps the brakes right as he gets to the copper in the side of the road. Second car has no reaction time or braking room, so swerves to not run up the ass of the first car and inadvertently slams into the copper on the road shoulder.
The 100km/h to 40km/h in an instant is a ridiculously stupid rule.
I don’t have the answer, but that rule won’t be around for much longer.....