The Department of Infrastructure is reiterating the meaning of 'closed' amid the Mountain Road being shut.
In a post on social media, the DOI is reminding people the route is currently shut to motorists, cyclists and pedestrians.
It comes as preparation work is taking place ahead of the TT, which starts next month.
The Department adds those entering the closure without authority could face a hefty penalty.
One weekend sailing cancelled, others at risk because of weather
Politician questions risk of Easter meningitis outbreak
Firefighters tackle flat fire down South
Weather warning for storm Dave this weekend
Roads to close for music festival this weekend
How long do mental health patients stay in Manannan Court?
Could you take over this former restaurant?
Framework of new Sea Services Agreement ready, says minister