Bulli Pass will close this morning, with the RMS carrying out safety work on the busy road way.
The pass will close in both directions from 9am until 3pm today (Wednesday) and tomorrow (Thursday), with workers maintaining guardrails and clearing vegetation.
Drivers are being encouraged to use the M1 Princes Motorway and Lawrence Hargrave Drive, or the M1 Princes Motorway and Memorial Drive as an alternative.
The 12 thousand motorists who use the road each day are being told to leave plenty of extra time for the diversions.