The first sod has been turned on the new Clontarf to city centre cycle lane and bus priority route.
There will also be upgrades to water infrastructure carried out as part of the works that are expected to be completed by March 2024.
The C2CC Project will provide segregated cycling facilities and bus priority infrastructure along a 2.7 km route that extends from Clontarf Road, at the junction with Alfie Byrne Road, to Amiens Street, at the junction with Talbot Street at Connolly Station.
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Lord Mayor of Dublin Alison Gilliland said: “I am delighted to have reached the point where we can begin work on this immensely important project. It will help in the promotion of safer cycling while also bringing safer driving and walking experiences, as well as improved bus facilities.
"It will play an important part in our common objective of reducing our carbon foot print and includes further greening along the route.
"The Clontarf to City Centre Project is a key step forward in Dublin City Council’s plans to continue to rollout a state of the art cycling network throughout the city."
Transport Minister Eamon Ryan said the project will deliver "exceptional" benefits to those looking to sustainable travel.
He added: “With improved bus priority, continuous and segregated cycle lanes and improvements to pedestrian infrastructure and the public realm; the C2CC will connect with the existing Sutton Cycleway, providing Dublin for the first time with a complete segregated route for cycling from the outer suburbs to the heart of the city centre."
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