Northern Ireland commuters face having no Ulsterbus and Metro bus services for one week later this month.
It comes after bus drivers from two trade unions - Unite and GMB - voted to take strike action over a pay offer from Translink.
The unions are calling for a 6% pay rise for drivers.
Read more: Strike action confirmed shutting down Translink bus services across NI
The strike action is planned to start on Monday, April 25 and will conclude on Sunday, May 1, with an additional single day on Friday, May 6 to mark the Stormont Assembly election count beginning.
A Translink spokesperson said the company was disappointed by the latest vote and said it was working to avoid the action.
And with the planned strike due to take place on the week schools return from the Easter holidays, the transport company has said keeping school services open was a priority.
All train services will continue to operate as normal.
Just last month, school buses were among the services impacted by strike action as Unite members demonstrated over a proposed 1.75% local government pay offer.
On Thursday night Translink's director of commercial operations, David Cowan described the seven day strike as "excessive".
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"It's the impact that we are going to have on so many people that I would really worry about," Mr Cowan told BBC Radio Ulster's Evening Extra programme.
"About 700 passenger journeys will not be able to be made that week - that's people going to work, hospital appointments.
"About a quarter of households in Northern Ireland do not have a car so it's so important that we think about the impact of this strike."
The public transport union Unite said the industrial action had the potential to "paralyse all bus services" in Northern Ireland.
Unite and GMB members initially balloted their members on the matter, with Translink offering a 3% pay rise, a level the unions have claimed represents a real terms pay cut for staff and one which has been rejected four times by their workers.
Unite deputy regional secretary Davy Thompson said: "Any action taken will inevitably cause severe disruption to bus services across Northern Ireland but my members cannot accept seeing their standards of living collapse.
"Translink needs to realise the error of its ways, table an improved offer and return to the negotiating table."
GMB said 82% of its members backed strike action, with unions submitting a pay claim of 6% to help the bus drivers, cleaners and shunters cope with rampant inflation.
Peter Macklin, GMB organiser added: “Translink fails to recognise what workers went through during the pandemic. They kept transport running so other essential workers could get to and from workplaces to perform vital roles.
“Our members were proud to carry out their duty in delivering the service, potentially putting themselves and their families at risk. When we clapped every Thursday night, we said the essential workers would not be forgotten or left behind.
“But during this cost of living crisis, Translink is forgetting their own workers. The dispute will close the entire bus network within Northern Ireland. It will be a complete shutdown.”
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