Disruption is again looming for bus passengers in Auckland, with the union for employees at NZ Bus issuing notice of industrial action.
Mediation between the company, which oversees most of the bus services in the region, and the Combined Unions last month failed to resolve the ongoing dispute.
A union spokesperson, Karl Andersen, says they'll be taking industrial action from 4.30 on Thursday morning.
Mr Andersen says staff will be following company procedures and not doing the extra work they normally would - which is the same action that prompted the company to issue a lockout notice last time.
NZ Bus won't comment on whether it intends to lock staff out again, saying it is taking time to consider the situation.
It is however warning customers to start thinking about alternative ways to get to work on Thursday, and apologising for the uncertainty.