Bus Vannin says its services in the west of the island will divert around roadworks on the TT course which are due to start today.
The Department of Infrastructure is doing work to improve drainage at Creg Willey's Hill in time for this year's racing.
It means the course will shut between Ballig Bridge and Cronk y Voddy from 9.30am today.
Isle of Man Transport says its buses will divert via Poortown Road and Knocksharry to Kirk Michael.
House plan to restore Foxdale Deads
Douglas to sign Friendship Agreement with Dublin
Ramsey hosts postponed fireworks display
Tractor run takes to roads this evening
Port Erin hosts lights switch-on
Joe Locke meets princess at annual carol concert
New weather warning issued
Santa's on a Bike ready to raise money for Rebecca House