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.
Stay off damaged slipway in Laxey, says local authority
MHK sues attorney general and returning officer over election votes
Islanders reminded to keep challenging domestic abuse beyond October
Peel fireworks kicks off the Island’s bonfire season this Friday
Yellow weather warning for coastal overtopping remains in force today
Nominations open for 10 local authority by-elections
MHK wants answers on support for home-schooled children
Weather warning for tonight and tomorrow