ACTION bus services have been cancelled between 10am and 2.30pm to allow drivers to attend a meeting convened by the Transport Workers Union.

Limited buses will be available between 9.30-10am and 2.30-3pm, as drivers transition from their shift to the meeting.

The meeting will effect the entire network, except for the special needs transport and flexible bus services.

The ACT government and the union have been locked in talks over a new agreement for drivers for about two years. The main sticking point has been weekend shifts, which are set to ramp up when the government rolls out its new bus network in late April.

The network will offer faster, more frequent buses and more late-night and evening runs.

Transport Workers Union ACT-branch secretary Klaus Pinkas said members would on Wednesday, December 19 vote on whether to accept the government's latest offer, which essentially retained the terms in their existing agreement.

Mr Pinkas did not wish to speculate on the likely outcome of the vote, but said if members rejected the offer they would either launch industrial action or head back to the negotiating table.

He said the impasse over weekend conditions had been resolved.

Transport Canberra operations executive director Judith Sturman said the authorised meeting had been scheduled outside of peak times to minimise disruptions to commuters.

Passengers are being asked to plan ahead to avoid inconveniences.

"We thank the Canberra community for their cooperation and understanding, and we acknowledge the disruption to services this has to allow for this to occur,” said Ms Sturman.