Have no idea what caused the initial "offense". However, given the significant restraint that the pickup truck driver exhibited in the video while underway, and given the size of the piece of equipment that he had secured in the back of his truck, I would have a hard time believing that he intentionally made any rapid, unsignaled moves at speed on the open road...
As my B-I-L the retired police officer is fond of saying. "They had the right to remain silent. Unfortunately, they did not have the intelligence to exercise that right..."
