A long stretch of the A83 has been shut after a major landslide at the Rest and be Thankful road, west of Loch Lomond.
A section of the road, between the A814 at Arrochar and the B828 will be closed until further notice.
A total of 400 tons of soil and rock, loosened by several months of rainfall, tumbled down onto the road at about 0300 GMT on Sunday. No-one was injured.
A subsequent landslip on the underside of the road then took place. No vehicles were on the road at the time.
Geotechnical staff are assessing the damage to the road and what steps might be necessary to secure it.
The effect of further heavy rainfall forecast overnight will also be monitored. Road maintenance company Transerv said it does not know when it will reopen.
A landslip at the same place three years ago led to the road's closure for a couple of days.
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