I would like to see a better description of where each group of participants were at the time of the crash:
.
A: Fully on Shoulder
B: Split on both sides of Rumbles
C: Fully on Road (as far right as possible or centered)
.
And, then a description for the groups:
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1: Lead Group (far enough ahead to be unaware of the accident)
2: Middle Group, immediately in front of the SAG Wagon
3: SAG Wagon
4: Following group behind SAG Wagon
5: Truck Driver
.
Yes, those cyclists a half mile ahead would help explain some of the group mentality.
Obviously there is no excuse to slam into the back of a group of cyclists. Yet, I don't think I would be happy to ride in a lane on that road, even with light traffic.