Auckland Transport is investigating allegations of impropriety and a serious conflict of interest brought to its attention by the Herald.
An Auckland Transport spokesman said it was taking the matter seriously and further investigations and inquiries were underway.
The spokesman was not in a position to comment about the specifics of the allegations.
They are not linked to the case of three top transport officials accused of bribery totalling more than $1 million.
The trial of the three officials is set down for September next year and expected to last eight weeks.