The N4 is approximately 6 km in length involved the on line widening of the existing road from two lane dual carriageway with hard shoulder, to three lane dual carriageway with bus lanes along one of the busiest roads in Ireland. The scheme included sections of split level carriageway and conversion of the at-grade signalised Newcastle Road junction to a grade separated junction.
The detailed design included all aspects of the highway widening to accommodate new traffic lanes in both directions including bus lanes and improvments at existing bus stops. 3 no. new bridge structures were provided from pedestrian over bridges to a new grade separted interchange at Newcastle. Detailed design of all new pedestrian facilities at junctions and provision of footpaths and off road cycle tracks along both sides of the N4 mainline. Design of extensive temporary traffic management (measures employed during the construction stage. Continouos presence on site during the construction contract monitoring construction and carrying out any design changes.
“Even in these times of significant economic constraint the Government is committed to investing in top class transport infrastructure. This new €75m dual carriageway upgrade is a further example of this commitment. The upgrade will shave almost half an hour off in-bound morning journey times which will be welcome news for all who use this route. The project was delivered on time and within budget and its benefits are manifold. It will reduce journey times, provide safer travel, reduce congestion and improve access to Dublin Airport and Dublin Port.”
Mr. Noel Dempsey
Ireland’s minister for transport