Authorities will use explosives to destroy an unsafe boulder on the Clyde Mountain on Wednesday, forcing the closure of the Kings Highway for about 18 hours.
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The boulder, which sits about 1.5 metres above the road, is at the site of the major landslide last month which left 1400 tonnes of debris blocking the main link between Canberra and the south coast for nearly a week.
NSW Road and Maritime Services plan to use explosives to shatter the boulder into smaller pieces, and then remove it from the mountainside.
The boulder was deemed to be a danger to cars on the highway during an inspection last week.
The work is going to block the Kings Highway again, with NSW authorities planning to divert traffic from Braidwood and Batemans Bay.
A temporary catch fence will be removed, and then reinstalled to allow road crews to clean up the site following the demolition.
More debris left over from last month's landslide will also be removed during the closure.
The road will be closed from 6am until midnight on Wednesday, weather permitting. Signs will advise of diversions and road closures.
