If there was no witness, the family has no way of knowing that. If there was a security camera somewhere recording the accident, I guess that would have counted as a witness. I don'tknow what kind of switch the motorcycle headlight has, but I think the setting would have remained the same after the accident to verify the claim of not being in use. But the cycle's rider should have seen the headlight of the car befor entering the intersection. Some newer cars have their version of "black boxes" to download recent speeds and driving habits (seatbelt buckled). A New Jersey Governor recently was injured in a crash and it was found that his driver was going faster than was claimed. Maybe either vehicle in this quiz had such a thing.