I went through there again today, twice, and had a good look around. There is a gully to the west of the collision site, roughly 250 metres. There is not a continuous line of sight. There was definitely a period of time when the two vehicles would not have been visible to each other. Also at that time (as I mentioned in a previous post) the road was diverted and barriers were in place. This would have further restricted the line of sight between the 2 vehicles.
My personal conclusion is they didn't see each other until seconds before the collision.
It is also my personal opinion that there wasn't enough room for a continuous non-stopping U turn, and that the term is being loosely (erroneously perhaps?) used to describe a 180 degree change in course. There were only two lanes of pavement with a narrow gravel shoulder on the north, and concrete barriers on the south, right against the line marking the edge of the lane. Certainly not enough room to do a 25 km/hr U turn without leaving some major skid marks. It would be a burnout/Donut maneuver like you'd see in a James Bond movie.
I think what they mean was he was going 25 km/hr when he decided to turn around.
Regardless, it was a dumb place to turn around with bad sight lines.
It was also a bad place to be doing 140+ km/hr. on a bike at night. It was fresh new asphalt and apparently there were no other vehicles visible, except maybe the tail lights of a car far ahead (the cop), so I can easily understand how he could be doing that. Its very easy and effortless on a bike like that and I can easily see myself doing the same thing.
He would have seen nothing until he got to the chicane, where his lane was quickly diverted 2 lanes to the left to reveal the cop car across the road, hidden by the barriers.
Very sad and tragic.