On the 16th of October 2022, phase 4 introduced new G Spine services.
| Route | Areas Served |
| G1 | Ballyfermot – City Centre |
| G2 | Ballyfermot – City Centre |
| 60 | Sir John Rogerson’s Quay – Red Cow Luas |
| Day | Time Range | Frequency |
| Weekdays | 06:00–22:00 | Every 10–15 minutes |
| 22:00–00:00 | Every 30 minutes | |
| 00:00–05:00 | Every 60 minutes | |
| 05:00–06:00 | Every 30 minutes | |
| Saturdays | 07:00–23:00 | Every 15–20 minutes |
| 23:00–00:00 | Every 30 minutes | |
| 00:00–05:00 | Every 60 minutes | |
| 05:00–07:00 | Every 30 minutes | |
| Sundays & Holidays | 08:00–10:00 | Every 30 minutes |
| 10:00–19:00 | Every 10–15 minutes | |
| 19:00–00:00 | Every 30 minutes | |
| 00:00–08:00 | Every 60 minutes | |
| Overnight Service | All nights | Every 60 minutes |
The combined frequency along the central G spine section is approximately twice as frequent as the values above.
G1 & G2
Route 60
Spines are very frequent routes made up of individual bus services. In Phase 4 the Spines are G1 and G2.
Other city bound services operate into Dublin City centre. These services are not part of any Spine and operate to their own timetable. In Phase 4 the radial is route 60.
