Hopefully the driver you subsequently hit will not get "whiplash" as a result of you being rear ended. These situations can get complicated. I do not trust any casualty insurance company, no one wants to pay. My wife always complains how I spend considerable driving time watching my rearview mirror (you do not have to ask why.). Good luck and I hope you and your wife do not feel any aches and pains later. Jay
PS: Did anyone's airbags go off?