The N/M20 Cork to Limerick Project is a key element of Project Ireland 2040, the Government’s long-term strategy to make Ireland a better country for all. The NDP outlines that the project would improve connectivity between Ireland’s second and third largest cities by enhancing the transport network. A multi-disciplinary team have formed with sustainability and future-proofing fundamental to the planning and design process, responding to European goals to reduce transport related emissions. From Phase 1, road and rail were investigated, looking at use of the corridor and the opportunities available for behavioural change. At Phase 2, attributes including accessibility and integration were addressed, analysing the potential socio-economic impact of the scheme on vulnerable groups, journey times and multi-modal travel. Emerging guidance documents, including NIFTI, were managed proactively, with their requirements incorporated into the appraisal process at the earliest opportunity. Phase 2’s conclusion saw “Our Transport Solution” emerge, a multi-modal proposal incorporating road, rail, bus, active travel and environmental aspects to address the issues and opportunities identified in the corridor. Phase 3 has seen the refinement of “Our Transport Solution”, responding to further changes in Irish and European guidance and investigating opportunities for a mobility hub network within the study area.