Wellington Tramways Union members will hold a stop-work meeting on Wednesday.

Wellington bus drivers will hold a stopwork meeting on Wednesday as they continue to negotiate terms for new contracts.

Drivers in the Tramways Union will meet to vote on collective agreement offers from bus operators Tranzit, NZ Bus and Uzabus.

Greater Wellington Regional Council confirmed on Monday that the union's drivers will hold a stop-work meeting on Wednesday.

It is understood drivers will vote on whether to stage a strike, which could cause widespread disruption.

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However, Wednesday's meeting is not expected to affect peak-time commuters.

Services in Wellington City, Hutt Valley, and Porirua will be reduced between 9am and 3pm, Greater Wellington Regional Council said in a statement.

"The meeting is an opportunity for the Tramways Union to talk to its members and is a normal occurrence," it said.

Normal services will run until 9am and after 3pm.

School services should not be affected.