Extension work has started on a rock barrier fence near Castlerock, close to Coleraine.
The work at Seacoast Road in Downhill is expected to last for approximately three weeks.
A spokesperson for TransportNI said: "In order to ensure that materials and equipment are offloaded safely, it will be necessary to restrict traffic to a single lane for a distance of approximately 50 metres.
"During these short periods temporary traffic control will be in operation and delays of a few minutes are possible. Two way through traffic will be maintained at all times for the duration of the works."
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