A section of the TT course will close for two weeks in March.
The Department of Infrastructure says it needs to do drainage work at Glen Helen, installing pipes under the road and resurfacing it to prevent problems during TT and MGP.
As a result, the course will shut from Ballig Bridge to Ballabooie Road from Monday, March 18 to Friday, March 28.
The DOI says it will divert bus services around the work as the road will be impassable.
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