He moved off the road like he is supposed to when he saw the speeding vehicle with emergency flashers going. The question is, why didn't the white truck do so and was there REALLY an emergency??
Now, Thats Two initial lane changes.
(”Red” simply over-reacted when he saw the flashing emergency lights flashing behind him. He probably thought a true emergency was in progress.)
Then “Red” looked in the mirror,( with blind spot), and did not see “white” moving into his lane, yet saw the “emergency” vehicle in the fast lane getting ready to pass, so he moved back into right lane. White was in his blind spot. White moved left to avoid red.
Now, Thats two more abrupt lane changes. A total of four.
Then “Red” looks in mirror, only to see Corzine crash.
“Red” made a simple mistake while dealing with an “emergency” situation, that being a sitting governor rushing to a photo op.