Speed camera operators have refused to use a computer system that tracks their work as they ramped up industrial action yesterday.
GoSafe workers escalated their campaign in a row over union recognition and working conditions ahead of a three-day strike planned over the October bank holiday weekend.
Siptu organiser Brendan Carr said that members – who make up more than half the workforce – refused to use the Telogis tracking system yesterday.
They are demanding that GoSafe recognises the union and attends talks on their demand for a pay rise and improved conditions.
He said the computer system effectively tracks everything they do when they log their activities through an app.
Meanwhile, a 72-hour stoppage will begin at 9am on October 26.