Motorists are currently experiencing delays on the Racecourse Road in Derry.
The delays are being caused by a broken down lorry on the Greenhaw Road.
Long tailbacks are expected and motorists are being encouraged to avoid the area.
A PSNI spokesperson said: "Police are advising of traffic disruption at the Greenhaw Road in Derry at its junction with the Culmore Road due to a broken down lorry. Motorists should seek an alternative route."
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