premise: A biker is critically ill in hospital after colliding with a lamppost in Pete The incident happened at 1.50pm yesterday in Thorpe Road. The 23-year-old was riding a Lexmoto Arrow 125 when, for an unknown reason, he left the road and collided with a lamppost. He was taken to James Cook University Hospital, in Middlesbrough, where he remains in a critical condition. Any witnesses to the collision are asked to call Durham Police on 101, quoting incident number 288 of July 9.
hypothesis: The Lamppost was stationary.
reason: Lampposts don't typically move.