TRAC Engineering has begun essential work on the A890 at Stromeferry.
The work will take place on the rock face to the west of the avalanche shelter.
A traffic management plan will be in place for up to 12 weeks to allow the work to take place.
The Highland Council is advising all road users that the road to rail bypass is now in operation.
A Council spokesman said: "We have worked closely with Network Rail and our contractor TRAC Engineering Ltd to keep disruption to road users to a minimum when the road/rail diversion is in place but inevitably there will be times when road users will face longer waits so we urge people to plan their travel carefully, allow extra time and avoid the periods when the diversion is not going to be available."
The traffic management and works are expected to be complete and the road fully re-opened by 24 November.
(CM/MH)
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