I have no idea if anyone involved was passing or simply drifted over the line in that sweeping curve. Nor does anyone else not involved in the investigation, except for maybe witnesses.
For all I know a motorcycle blew a tire sending it across the center line into the truck causing the truck to veer across the center line into the rest of the MC's, or vice versa. Could have been anything which caused this. Like a deer.
And I'm not talking about NH. I'm talking about this specific collision venue based on the pics. Look at the pics, they don't lie.
What I do know is there was a sweeping curve just before the point of impact and the POI area is a high spot in the highway, in addition the trucks point of rest is on the wrong side of the highway, as well as some of the MC's. And I'm not basing any of this on speculation, but the scene images.
The accident occurred 500 feet from the B&B that most of the bikers were staying at. I’m guessing that factors into the accident. (Turning onto the road, slow or stopped waiting for others, etc??)