Transport for NSW regional director Anna Andrews said there had to be a "reasonable balance" between the needs of owners and motorists, and it was not planning any extra signage.

"When considering project signage, the safety of motorists must be considered," Ms Andrews said.

"There needs to be a reasonable balance between the size of the signs and effect on road users."

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Signs were placed in Barber Street and Conadilly Street last week to advertise businesses while New Street is closed.

But the advertised businesses were not 100 per cent pleased, with Gunnedah Veterinary Hospital's logo displayed in the wrong colour.

However, Ms Andrews said this would be rectified soon.

"[We] will replace the incorrectly coloured logo as soon as possible," she said.

She said the signage was discussed at the October meeting of the newly formed Business Focus Group (BFG), and was "only one of several ways Transport for NSW is assisting businesses during the road closure".

"The new Gunnedah bridge Business Focus Group was formed to provide information about progress and to address issues and opportunities that arise during construction," Ms Andrews said.

"This focus group is not a decision-making body but it will have an interactive function and manage feedback on various project-related matters."

The group is chaired by Daracon's Louise Neville and members include Gunnedah Shire Council's economic development manager Charlotte Hoddle and various business owners.

A council spokesperson said it had "advocated on behalf of the members of the group for greater consultation and support of affected business which has resulted in the formation of this group".

Topics of discussion at each monthly meeting include updates on the construction of the new bridge, advertising, and more.

Business owners in Barber Street or surrounding streets affected by the closure of New Street are encouraged to join the group by contacting the direct, toll-free project line on 1800 029 585.