The road used to divert traffic past a landslide at the Rest and Be Thankful in Argyll has reopened after being closed overnight on Tuesday.
The Old Military Road is being used after the A83 was blocked by a "significant landslide" at the same location for the second time in six weeks.
Work to clear 5,000 tonnes of debris is ongoing.
Officials said it was hoped it could remain open on Wednesday night.
The road's closure meant drivers had to follow a 59-mile (95km) diversion.
Safety assessments took place from 07:00 on Wednesday to determine it was safe to reopen.
The main route only reopened on 7 September following a 10,000 tonne landslide at the beginning of August.
- 5 days ago
- 6 days ago
- 7 September