it looks like it was as much the bikers fault as the cagers. as it seemed tThey were both trying to pass the car in front of the red one. I had a similar thing happen to me 2yrs ago. I went to pass a truck pulling a 5th wheel and when I reached the front of the trailer portion, he starts to pass a car he was tailgating that I couldn't see. Luckily for me there was a nice shoulder to go out onto. Thats why I always pass at max aceleration, i feel it minimizes risk in that situation.