
Quoting
cdwjava
Pedestrians, skateboarders, cyclists... yes.
At least under CA state law, one cannot make a turn or divert from traveling straight ahead without first affirming that they can make the movement in safety.
A prudent rule.
All because the driver might be at fault for a sudden or unsignaled turn, doesn't mean it will be of any great comfort to you while you are in traction.
Fault as assigned by law enforcement in CA (where Sniper works) can be different than the fault assigned by an insurance company or a court. Law enforcement cannot divide fault amongst the parties whereas a court or insurance company can apportion fault between the parties. For our purposes, the key is most often where the vehicles were at the time of the collision - hence the reason I asked about the position of the turn relative to the intersection in the original post. Unless this driveway was just past the intersection, the driver of the vehicle is generally going to be at fault for failing to make certain that it was safe to make the turn.
If the moving truck was signaling and began the turn onto the intersecting street in the proper lane, then the cyclist should have yielded until the truck had completed the turn. The cyclist's failure to control his speed was not a defense. He has a legal obligation to drive at a safe and prudent speed for the road and conditions (VC 22350 still applies even to cyclists).
Brian57 is in CA, so I am assuming this is a CA incident.
As for the authority to determine fault, well ... if the collision occurred in a contract city where the Sheriff's Department provides contracted law enforcement services, yep, he has the authority to determine fault (at least, his office does - and he has the final say). While it may have been premature, his statement may also have been based upon the conclusions of his investigators at the scene.