Drivers faced 40-minute delays on the A90 north of Dundee.
Google Maps traffic data showed a mile-long queue of southbound traffic approaching the Claverhouse Road junction shortly after 11am on Thursday.
Stagecoach East Scotland said buses were significantly delayed as a result.
The bus operator posted at 11am on Thursday: “Due to ongoing lane closures on Forfar Road, Dundee, all services 20 and 21 are suffering delays of up to 40 minutes.”
Motorists also reported significant delays on Thursday morning.
The lane closure came as work to fix a fault on telecoms equipment takes place beside the Morrisons car wash.
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