An incident during Tuesday night's Manx Grand Prix practice, and a landslip, led to today's Mountain Road closure.
The Department of Transport has confirmed they are relocating a marshals shelter at the 27th Milestone after a bike left the road and hit it during the session.
Rider Simon Perkin was airlifted to hospital from the scene and a marshal - Hugh Evans - was seen by a Doctor before being given the OK.
The Mountain Road is due to re-open at two o'clock.
Sports Editor Tim Glover found out more from Clerk of the Course Phil Taubman:-
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