The Department for Infrastructure is warning people it's out line painting today.
A team will be on the Tholt Y Will road between 9am and 5pm.
It's while the roads are closed for racing.
Spectators for the MGP transiting between the Bungalow and Sulby are asked to be aware and ride with caution.
The DOI has also added the upper parts of the road are unfenced and sheep do wander across the road, so to always be prepared to stop.
Committee to examine link between poverty and poor academic performance
Police advice for trick-or-treaters to stay safe
How will Manx Care reduce the number of negligence claims?
Manx Language Festival to be held next week
Manxman sailings in doubt from tomorrow
Car falls down steep bank on Mountain Road
Panic over - Mcdonald's reopens at 11am tomorrow
Police say beat it to cars illegally parked during MJ tribute act