The southern section of the A18 (Bungalow to Creg Ny Baa) will re-close to all traffic from 9.30am today.
The northern section (Ramsey to Bungalow) is remaining closed.
The whole of the Mountain Road from Ramsey to the Creg Ny Baa will then remain closed until no later than 3.30pm on Friday.
This closure is for resurfacing, road race preparation, cyclical maintenance and tree felling.
Access to the Bungalow/Snaefell is available at all times via Tholt Y Will Road/Sulby
Access to Creg Ny Baa is available at all times from Douglas/Onchan/Laxey via Hillberry and Creg Ny Baa Back Road.