Project Summary
The new dual carriageway directly connects the existing outer ring road at Williamstown Road on the East with the N25 road on the West.
Project Description
The works involved the construction of approximate 6.8km long dual carriageway and some short sections of single carriageway roads and five new at-grade roundabouts will be constructed.
The new road involved the construction of earthworks, new pavement layers, wearing courses, drainage works, services ducts, reinforced concrete structures and other miscellaneous work. The new dual carriageway connects with existing roads and crosses various other existing roads.
Implementation of proper traffic management measures to accommodate the existing vehicle, cyclist and pedestrian traffic.
Project Delivery
The Project involved all the construction work for a new dual carriageway project, including the following:
- The works included the construction of an embankment with a maximum height of 5m was constructed through the Kilbarry bog at the St. John’s River crossing.
- The construction work also involved the removal of existing road lighting and cabling at Williamstown road and the provision of new road lighting and cabling. New road lighting was installed at all the other new roundabouts and on the approaches except for the roundabout where the Outer Ring Road connected with the N25 road.
- Installation of the road lighting at the N25 roundabout and on the approaches.
- The new dual carriageway connects with existing roads and crosses various other existing roads. Implementation of proper traffic management measures to accommodate the existing vehicle, cyclist and pedestrian traffic.
- Various major reinforced concrete structures such as Lacken road bridge and the St. John’s River box culvert. Lacken Road Bridge – a 3-span integral reinforced concrete structure. The bridge is a monolithic construction, with continuous deck, and abutment walls and piers, are fully integrated with the superstructure. Minor reinforced concrete structures include various culvert wing walls and foundations for masonry walls. A new reinforced concrete weir in the new channel provided to divert the river.
- Mass earthworks (including deep excavations and high fill embankments)
- Pavement layer works and surfacing work
- Landscaping works
- Drainage works
- Kerbing works
- Footpath, cycle track and pedestrian crossings
- Accommodation of services
- Road lighting and electrical works
- Traffic signs and road marking works
- Safety barriers and fencing works
- Structural concrete works
- Environmental mitigation works
- Accommodation works
- Traffic management works
