Workers at the company that manages speed camera vans around the country are set to strike over the October Bank Holiday.
SIPTU members at GoSafe will take part in a 72 hour stoppage starting at 9am on Saturday October 26th.
It is part of a dispute over working conditions and union recognition.
It follows similar action last month, when operators downed tools for 24 hours.
SIPTU Organiser, Brendan Carr, said the action is a “last resort” and accused the company of “intransigence” with management refusing to address concerns health and safety and conditions of employment.
He said management had ignored a Labour court recommendation urging it to recognise SIPTU as the representative of its employees who are union members.
He also took aim at the Government for hiring a “company which imposes inhumane working conditions on its employees.”
The union has said staff can be stuck in their vans for up to 11 hours per shift.