You guys say there is not enough information. Well, there is a lot of information already. The only things missing is where did he start his turn from and where on the truck did the cyclist strike. If he hit the tractor and not the trailer, what does that tell you about possible fault?
If he hit the trailer, what does that tell you about possible fault? Answer each scenario please.
As a cyclist I have a very good idea how this could have happened... to even me.
To the cyclist's experience; He rode with a club called Big Orange. It is a club of mostly fast, experienced racers. They ride about 200mi a week in curvy, hilly Palos Verdes.