The local authority has admitted breaking the rules in October by voting to cut only part of its city centre roads overhaul.
In voting to make various bus gates permanent, the administration decided to scrap the ban on right turns from Union Terrace onto Rosemount Viaduct and Schoolhill, while keeping in place traffic bans on Market Street and Bridge Street.
But it has since emerged the move was not “legally competent” under the rare roads legislation which allowed the measures to be introduced without prior consultation.
And as traders rally against the bus gates and restrictions which have had a devastating impact on their businesses, the council is now seeking to "mitigate any risks" over a potential legal challenge by undoing the incompetent vote.
