From tonight, the mountain road will close each evening.
Up until Friday - the route from Ramsey Hairpin to the Creg Ny Baa will shut between 6.15pm and 10.15pm.
The Department of Infrastructure says it needs to undergo maintenance work - including hedge trimming, signage and safety equipment ahead of the Manx Grand Prix.
The DOI says - weather dependent - the work could be finished ahead of schedule - or pushed back until the weekend.
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