Unite Union's Newry branch is to stage a white picket on the Old Warrenpoint Road.
It's to urge drivers to reduce their speed.
The activists are also calling for traffic-calming measures.
The road's become an accident black spot with the most recent crash just last week.
The white picket is planned for Thursday at 6pm.
High Court told Gerry Adams ‘major, major player in war!'
Natalie McNally murder accused ‘lied and lied again’
Woman dies in two-vehicle collision in Enniskillen
Little-Pengelly leads mission to showcase NI in Washington on St Patrick’s Day
Psychiatrists warn of ‘workforce crisis’ facing NI mental health services