my friend was involved in an accident on the motorway where he moved for the fast lane, realised there was a car in his blind spot so pulled back into the middle lane.
the woman in his blind spot panicked and hit the central reservation and span across 3 lanes of traffic and ended up smashed in the hard shoulder
my friend was cleared of this after a bit of a court battle with her trying to sue him and her insurance company trying to blame him but he was let off as his vehicle never contacted hers and she was deemed to have overreacted!
different circumstances to you i know but your outcome may be the same?