OCSC were appointed by Laois County Council to undertake the design of a new orbital relief road to the north of the county town Portlaoise. The route acts as a bypass for the N80 National Secondary Route which currently runs through the centre of the town causing significant delays and congestion. The scope of the appointment for the project included Constraints Study, Preferred Route Report, Preliminary and Detailed Design, Part 8 planning process, land acquisition, contract administration, supervision of approximately 6 km of new single carriage way comprising two 3.65 wide lanes and two 2.5 metre wide hard shoulders, provision of cycleway and footpaths, public lighting, service ducting, surface and foul drainage, water main and gas mains.
The project links the M7 Portlaoise Bypass northeast of the town with the N80 Mountmellick Road west of the town. The road has to traverse the main Dublin Cork railway line and the Triogue River so that 2 no. underbridges were designed as part of the scheme. The road crosses a regional significant and vulnerable aquifer which provides potable water for the town and surrounding areas. A detailed site investigation and hydrogeological contract was put in place in order assess underlying conditions and to protect the aquifer following the construction of the road project.
OCSC provided all civil, structural, environmental and transportation engineering services for the development. Detailed consultation was carried out with local landowners and with the Elected Members of Laois County Council during the course of the project.