A21 Northern Ireland traffic
Incidents, roadworks and closures on the A21 (NI) in Northern Ireland, by junction and direction.
No incidents on the A21 (NI) now
3 entries in all. Source last updated 2 October 2026.
Incidents now 0
Planned roadworks 3
- Lane closure
A21 Zion Place, Newtownards
Starts Sun 18 Oct, 00:00
Lane closure: A21, Zion Place, Newtownards. Roadworks will operate as follows:-. Reason: Separation of Supply.
TrafficwatchNI (DfI) · updated 2 October 2026
- Lane closure
A21 Newtownards Road, Comber
Starts Sun 18 Oct, 00:00
Lane closure: A21, Newtownards Road, Comber. Roadworks will operate as follows:-. Reason: FRAME & COVER.
TrafficwatchNI (DfI) · updated 2 October 2026
- Full closure
A21 Ballynahinch Road, Saintfield
Starts Tue 3 Nov, 09:30
Road closure: A21, Ballynahinch Road, Saintfield. Roadworks will operate from 09:30 on Tue 3rd Nov 2026 to 16:30 on Fri 6th Nov 2026. Reason: tree cutting. Diversion in place.
TrafficwatchNI (DfI) · updated 2 October 2026
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Questions
- Is the A21 (NI) closed today?
- No full closure is reported on the A21 (NI) at the moment.
- Are there roadworks on the A21 (NI)?
- 0 in progress and 3 planned, listed by junction on this page.