The £7.5 million scheme aims to cut congestion, support new investment, improve air quality and encourage active travel.
Phase Four will replace the existing Westerhill Road and tie into Phase Three, which was officially opened last year, at the roundabout on Wester Cleddens Road.
The work includes the developing a new bridge and roundabout.
Enabling works to set out the line of the new road and clear vegetation has started, with the main contract due to commence at the end of the year.
-- Advertisement --
The road is anticipated to be completed around autumn 2017.
Westerhill Road will remain open during development, with the 'tie-in' to Phase Three programmed at the end to minimise disruption.
The project is part of the Council's ten year capital programme and is being part-funded using developers' contributions from the Bishopbriggs East housing development.
Councillor Alan Moir said: "The Bishopbriggs Relief Road continues to be a priority for East Dunbartonshire Council and I am delighted that we are here at the start of the fourth phase."
In total, there are five phases to deliver the complete relief road.
Phases one and two - which are largely within the Glasgow boundary - are complete and connect motorists to the Robroyston roundabout and onto the M80.
Phase three was funded by developers’ contributions and delivered by Taylor Wimpey as part of the planning obligations associated with its Bishopbriggs East housing development.
(LM)
