The Mountain Road will be closed from 9:30am today for the next three weeks.
The Department of Infrastructure is carrying on with planned works which started during last week's closure.
This includes TT preparations such as the installation of one way signage, race safety equipment and marshal and filming points.
Victory Café, the Creg ny Baa, Snaefell Mountain Railway and Summit Café will all be open as usual throughout the closure.
Nominations open for Manx cultural hero awards
Passport and immigration public counters to temporarily close
Overnight delay means today's sailings will set off late
Fireworks displays to kick off with event tonight
Second night of police roadside car checks finds less defects
Society appeals for help about traditional gypsy caravans on the Island
Government issues bird flu warning after infected buzzard found
Will new UK law be brought in to protect Manx renters from mould?