Another Grim Imponderable

We often provide traffic control for the Police serious crash unit. After a fatal crash the road is surveyed, a skid test done, photo's taken, any evidential marks on the road are measured and plotted. The results can then be fed into a computor and simulations done. This can usually discover the "How", something happened, but often the "Why" is inexplicable.
On the road we believe that fatigue and consequent inattention is the biggest killer, but in this case the accident site was only a bit over an hour from New Plymouth. It is not in a cell phone coverage area, so a mobile phone wasn't the culprit. I had passed the site ten minutes before, there was very little traffic, it was a great day for a drive.

"A car crash which took the life of a New Plymouth woman 10 days ago has now claimed the life of her daughter.
Dianne Ruth Morgan (46) was killed instantly in the crash on State Highway 3, just south of the Mangaotaki Gorge near Piopio, about 12.50pm on Saturday, February 12.
Her daughter Kenna Je-oan (7) was taken to Waikato Hospital with major head injuries.
Mrs Morgan had been driving north around a sweeping right-hand bend when her vehicle veered into the opposing lane and into a south-bound Land-Rover towing a horse float with a horse on board, Senior Constable Kevin Hearfield, of Otorohanga, said yesterday.
The male driver in the Land-Rover was not injured.
Mr Hearfield said it would probably remain a mystery as to why Mrs Morgan's car crossed the centre line.
The weather was good and the driving conditions excellent. There was no suggestion of speed, alcohol, drugs or mechanical faults.
The serious crash unit had drawn a blank. "Unfortunately, there are no independent witnesses and no evidence we could find on the road that would indicate what happened."
(Taranaki Daily News)