Unions representing drivers at Dublin Bus are meeting to discuss a possible all-out strike.
They say the industrial dispute will escalate, but that an all-out strike is the 'nuclear option'.
A 48-hour work stoppage is underway, with another two-day strike planned for next week.
SIPTU's Owen Reidy, says it could move to an all-out strike if management at Dublin Bus don't start negotiating.
Dermot O'Leary from the National Bus and Rail Union, says the Transport Minister Shane Ross, isn't taking the issue seriously.
