Even if you were twice the required distance from the car in front, the time it would take to turn back and look ahead, then take on board that the cars in front had slammed their brakes on would probably still not be enough. Remember, the last time you saw it, the car would have been moving. A complete accident imo. Gutted for u m8. Was it a 4x4? Looks like the bumper is fairly intact still.
John