Discription of Events: The guy on the motorcycle I was behind on my way to work in the morning decides to slow down way too much as he is making a right turn and as I am following him I have to swerve a little bit to the right so I did not hit him because once he made the turn he did not gain his speed back up to keep going. Had no blinker or hand motions that he was turning only turned his arm and head towards me with attitude.