The A82 has been closed between the Kilbowie Roundabout and the Erskine Bridge slip road due to an unsafe tree.
West Dunbartonshire Council officials said the due to forecast high winds brought by Storm Henry the road could be closed until after 8am tomorrow morning.
A council spokesman said: "Due to an unsafe tree, the A82 westbound between the Kilbowie Roundabout and the Erskine Bridge slip road has been closed.
"Due to the ongoing high winds, it is unlikely that the road will reopen tonight and may be closed for at least 18 hours."
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