There was no necessity at all for him to enter into a line of traffic travelling at sixty mph if his vision was obscured by low sunlight. It his hard to believe that a man of ninety seven has a reason so imperative that he would risk his life, and that of others, to drive when, by his own admission, he was unable to drive safely.
I am in my eighties, and gave up driving at seventy five, because I realised that my vision was beginning to be impaired by sun-glare.
He was quite happy to wrap himself in two tons of steel, and launch himself into high speed traffic, (the speed limit is sixty mph) even though, as he admitted, he was blinded by the low sun.