The 755m link road, which connects Auchinairn Road and Westerhill Road, was delivered by Luddon Construction and Taylor Wimpey West Scotland as part of a nearby housing development, while a new roundabout has also been created at Westerhill Road.
Phase one and two of the new road connects drivers to the Robroyston roundabout and on to the M80.
Councillor Alan Moir, Convener of Development and Regeneration at East Dunbartonshire Council, said: "I am delighted to officially open phase three of Bishopbriggs Relief Road and believe it will be a massive boost for the area.
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"The new phase means better access to the M80 and will help to reduce the amount of traffic using residential streets.
"It will also have an impact on congestion in Bishopbriggs town centre - improving access, reducing pollution and cutting journey times.
"This is a key step towards improving links to and from Bishopbriggs and the important business location of Westerhill. Bishopbriggs Relief Road plays a key role in both our Local Transport and Economic Development Strategies."
Willie Burns, Managing Director for Taylor Wimpey West Scotland, said: "This marks a further key milestone in the progress of Bishopbriggs Relief Road and Taylor Wimpey is delighted to see the works for phase three completed - marking our substantial and continued investment in the area."
Charlie Frize, Managing Director for Luddon Construction Ltd, said: "As a local company Luddon Construction was pleased to be awarded the contract by Taylor Wimpey to construct this new road.
"There is no doubt that this recently completed phase, together with the planned phase four, will make a substantial difference to the flow of traffic in the area."
Plans for phase four, which is intended to run from Wester Cleddens Road to Westerhill Road, are currently being discussed by the local authority, landowners and partners.
(JP/MH)
