There is one specific commitment within the South Dublin County Development Plan 2022–2028 in relation to the type of road infrastructure measures referenced in the question.

Table 7.5 of the Development Plan (Six-Year Road Programme) includes the following objective:

Kennelsfort Road and R148 (Chapelizod By-Pass): Support the provision of a grade-separated junction, or an equivalent solution, to be initiated during the first two years of the 2022–2028 County Development Plan. The objective of this intervention is to enhance the efficiency of the junction, particularly for bus movements on the N4 / Lucan Road Quality Bus Corridor, to ensure safe crossing facilities for all road users, and to improve connectivity between the Heritage Village of Palmerstown and newer residential areas. The Council will work in conjunction with the National Transport Authority (NTA) and other relevant State agencies to facilitate delivery.

In terms of progress on this objective, the Transport team has been supporting the NTA in the planning and development of the Lucan to City Centre Core Bus Corridor Scheme. Delivery of this scheme will significantly enhance public transport connectivity for Palmerstown and adjoining areas, while also providing improved pedestrian and cycling infrastructure in the Palmerstown village and Kennelsfort Road area. Any grade-separated or alternative junction solution would be considered within the context of this wider public transport–led intervention and subject to national funding, design development, and statutory approval processes led by the NTA.

In respect of the junction of Main Street, Rathcoole and Tay Lane, there are no current plans or adopted policy commitments within the County Development Plan to provide a grade-separated junction at this location.