Heavy rain has caused further landslips at the Rest and be Thankful, delaying the reopening of the key route.
Around 2,500 tonnes of debris from multiple landslips was caught in specialist netting above the A83 in Argyll and Bute earlier this week, forcing motorists on a diversion of almost 60 miles.
Engineers having been working to clear the road and make the hillside safe but further downpours put plans on hold as Storm Callum sweeps into Scotland.
Yellow Met Office warnings are in place for wind and rain in the Highlands and Islands and Strathclyde areas throughout Friday.
Forecasters said that some delays to road, rail, air and ferry transport are likely, as are delays for high-sided vehicles on exposed routes and bridges and some power loss is possible.
Met Office meteorologist Aidan McGivern said: “The wind gusts will approach 40-50mph across western parts of Scotland, Wales, western England and Northern Ireland.
“Accompanying high tides will be big waves and we could see coastal impacts from those and inland impacts from those strong winds as well.
“Later in the day as the deep low approaches north-west Scotland there is the risk of 70mph gusts for exposed parts.
“The rain is also of concern with a lot of it to come through 36 hours over Friday and Saturday, especially for western parts of England, south west Scotland and Wales.”