The Mountain Road will close later as motorsport equipment is taken down.
The Department of Infrastructure says the route will shut from 9.30am as workers remove safety barriers, hay bales, marshals' shelters and equipment boxes, and scaffolding.
The road will be closed between Ramsey and the Bungalow until 8pm today.
The DOI says it'll use the opportunity to clear gullies and do maintenance on tram crossings, while Manx Telecom will instal communication cables.