Today's action is the first of five Tuesday protests, which include Budget day and Halloween
The Garda Representative Association has begun its protest over Garda Commissioner Drew Harris' decision to change the Garda roster next month.
Rank-and-file gardaí are refusing to take up voluntary overtime today because of the commissioner’s refusal to defer the reintroduction of the so-called 'Westmanstown roster' prior to the start of talks between all sides.
However, Commissioner Harris insists he is ready and willing to begin talks on the issue of the disputed roster and the three other Garda associations are prepared to enter talks.
Today's action is the first of five Tuesday protests, which include Budget day and Halloween, two days with potential for sporadic public disorder and violence.
The GRA said this will culminate in a refusal by some GRA delegates to work the new roster and a withdrawal of labour on 10 November.
GRA President Brendan O'Connor says there's a simple way to avert the planned action.