The DoI is asking people to consider their journey during the current weather conditions, particularly in the northern and eastern parts of the island.
Its teams are actively gritting the TT course, but several areas have become hazardous and some vehicles have already become stuck.
It said: “We are currently treating these locations further to improve safety.”
Roads
The Mountain Road is closed.
The DoI has said these roads and areas are currently difficult to use – Barregarrow, Bray Hill, and Rest and be Thankful
However, residents in Ramsey, Laxey, Onchan, Peel and Douglas are saying their roads are either blocked by cars or icy.