The High Court in Belfast quashed a Northern Executive decision to proceed with the A5 road upgrade.
Mr Justice McAlinden says he's aware his ruling would bring fresh anguish to the families of those who've lost loved ones on the road.
Over the past 18 years, 57 people have lost their lives on the A5, making it one of Ireland's most dangerous roads
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The major road links Donegal to Monaghan through counties Derry and Tyrone
Mr Justice McAlinden says the proposed scheme breaches elements of the North's 2022 Climate Change Act.
Niall McKenna's from the Enough's Enough Group, is disappointed with the decision:
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Northern Ireland's Infrastructure Minister says she knows today's developments will be devastating:
