Artikel 3

Traffic in transit shall not be subjected by any authority within the transit State to customs duties or taxes chargeable by reason of importation or exportation nor to any special dues in respect of transit. Nevertheless on such traffic in transit there may be levied charges intended solely to defray expenses of supervision and administration entailed by such transit. The rate of any such charges must correspond as nearly as possible with the expenses they are intended to cover and, subject to that condition, the charges must be imposed in conformity with the requirement of non-discrimination laid down in article 2, paragraph 1.