The closure will be in place from 7pm on Friday, 23 March until 7am on Monday, 26 March.
The A21 Newtownards Road will be closed between its junction with Abbey Street and Church Street for traffic outbound from Bangor Town Centre.
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A road closure will also be in place on Croft Street to facilitate the works, with temporary traffic lights in operation to manage both local traffic from Croft Street and the inbound traffic to Bangor along the Newtownards Road. Diversions will be put in place, however motorists have been warned to expect delays in the area.
The overall project represents an investment of £10 million in the local infrastructure by NI Water.
The current phase of the programme involves the replacement of the existing Waste Water pumping station at Castle Park along with the upgrade of sewers in the area.
(CD/LM)
