The CityLink operator is obligated, for each financial quarter, to set vehicle toll charges including a maximum charge for a single trip. It is also responsible for informing the public partner of pricing changes no less than one month before they take effect and advising the motoring public of them (Victorian Auditor-General 2004: p.63-64). It is claimed by the Victorian Auditor-General's Office (2004: p.64) that although these conditions were met by the operator, the Office of the Director, Melbourne CityLink, uncovered on a number of occasions, "rounding or indexing errors" in the private partners' toll calculations before the charges were published. However, and on each instance, the operator took responsibility for correcting its mistakes (Victorian Auditor-General 2004: p.64).