The Belfast Court of Appeal has cleared the way for the delayed A5 road upgrade, overturning a High Court ruling that had blocked the project in its current form. The €2 billion scheme is planned for a 93-kilometre route between Derry and Aughnacloy in County Tyrone.
The decision is significant for Northern Ireland’s transport network, road safety campaigners, local communities and opponents concerned about farmland, emissions and environmental impacts. However, the ruling does not mean construction will begin immediately; further project and legal steps may still be required.
What happened in the Belfast A5 road case?
Judges at the Belfast Court of Appeal quashed the lower court decision that had prevented the A5 upgrade from proceeding as authorised. The appeal was brought by Northern Ireland Infrastructure Minister Liz Kimmins, with support from Agriculture, Environment and Rural Affairs Minister Andrew Muir.
The original High Court judgment, delivered in June 2025, found shortcomings in the government’s assessment of the project. Those concerns included climate obligations, environmental impact assessment requirements, human rights considerations and the method used to estimate emissions caused by additional traffic.
Appeal judges concluded that the High Court had made a fundamental error by failing to assess the road decision against Northern Ireland’s wider climate targets. Judge Siobhan Keegan said the legal requirement to reach net zero by 2050 does not automatically prevent approval of a new road, provided its consistency with emissions obligations has been assessed as far as possible.
Why the A5 upgrade matters
The proposed dual carriageway would become Northern Ireland’s largest road project, with an estimated cost of €2 billion. It would upgrade a 93-kilometre section of the A5 between Derry and Aughnacloy, creating a faster connection towards the border and the wider cross-Border economy.
Supporters say the existing route has a serious safety record. Official figures cited in the case indicate that more than 50 people have died on the road since 2006. Families represented by the Enough is Enough campaign argued that public safety and the right to life must be given substantial weight when considering the future of the route.
The road is also viewed as an important link between the north-west and Dublin. Improved transport infrastructure could affect freight movement, commuting, regional investment and access to services, although the final benefits will depend on the project’s delivery and design.
Key facts
- Project: A5 road upgrade
- Route: Derry to Aughnacloy, County Tyrone
- Length: Approximately 93 kilometres
- Estimated cost: €2 billion
- Court decision: Belfast Court of Appeal quashed the High Court ruling
- Main dispute: Road safety, climate duties, environmental effects and legal compliance
Climate and environmental objections
The Alternative A5 Alliance, an umbrella group representing local residents and landowners, challenged the project’s approval. The group raised concerns about the effect of construction on farmland and the wider environment.
The High Court had previously found that the Department for Infrastructure had not adequately demonstrated compliance with the Climate Change Act 2022. Section 52 places duties on Stormont departments relating to emissions reductions and the overall objective of reaching net zero by 2050.
Another issue involved induced traffic: the additional vehicle journeys that may result from a larger or faster road. The lower court said more consultation was needed on the methodology used to estimate the greenhouse gas emissions associated with that traffic.
The appeal ruling addresses the legal approach taken by the High Court, but environmental issues remain central to the project. Any future work will still need to comply with applicable planning, environmental and construction requirements.
A5 road upgrade timeline
- Since 2006: More than 50 people are recorded as having died on the A5, according to figures cited in the case.
- October 2022: Tyrone Gaelic footballer John Rafferty, aged 21, was killed on the road, prompting the formation of the Enough is Enough campaign.
- 2024: The Department for Infrastructure approved plans for the 93-kilometre upgrade.
- June 2025: The High Court ruled that the scheme could not proceed in its planned form.
- October 2026: The Belfast Court of Appeal overturned that ruling.
What happens next?
The appeal judgment removes the specific legal barrier created by the High Court ruling, allowing the project to move forward within the existing approval framework. It does not itself set a construction start date or resolve every practical issue surrounding the scheme.
Authorities will need to determine the next steps for procurement, design, land, environmental compliance and construction planning. The project has already faced delays because of legal challenges, so its timetable remains an important question for communities along the route.
Campaigners opposing the road may also consider whether any further legal options are available. The supplied judgment does not confirm the outcome of any additional challenge, meaning the project’s immediate legal position is clearer but its final delivery timetable is still developing.
Frequently asked questions
What is the A5 road upgrade?
It is a proposed €2 billion project to upgrade approximately 93 kilometres of the A5 between Derry and Aughnacloy in County Tyrone.
Why was the project challenged?
Opponents raised concerns about farmland, environmental effects, greenhouse gas emissions, human rights considerations and compliance with Northern Ireland’s climate legislation.
What did the Belfast Court of Appeal decide?
The court quashed the High Court ruling that had blocked the project in its authorised form. This clears the way for the scheme to proceed, subject to remaining requirements and any further legal developments.
When will construction begin?
No construction start date is confirmed in the available information. The authorities must still progress the necessary project and delivery arrangements.
Conclusion
The Belfast Court of Appeal ruling is a major development in the long-running A5 road dispute. It restores the legal basis for Northern Ireland’s €2 billion road project while keeping road safety, climate responsibility and environmental protection at the centre of public debate. For communities along the Derry-to-Aughnacloy route, the immediate takeaway is that the scheme can now move forward, but construction and the final timeline are not yet guaranteed.
