To facilitate the new commerce all hitherto existing trade restrictions and barriers were removed, tolls on products transported either by water or by land were abolished, and commerce was given free movement. By a statute of Casimir Jagiello of the year 1447 the principal navigable rivers of Poland were opened to unobstructed water transportation, the public good and abundance of necessary commodities being now regarded as more important than fishing rights. At the same time all internal tolls were annulled and abolished and their collection prohibited.[371] The new regulations with their penalties for their transgressors were renewed and reaffirmed in the reign of John Albert in 1496.[372] And since there were some who disregarded these statutory provisions, as for instance the burghers of Thorn, John Albert promised to exercise special vigilance in their enforcement in order that water transportation to Danzig might be free and safe.[373] Nevertheless, in spite of these laws, there still were complaints in the Diet of 1538 against the collection of transport tolls by private individuals. In consequence of these all privileges granted private individuals and towns to levy and collect road and bridge tolls, with the exception of such as were necessary for the convenience of the travelling public, were abrogated altogether.[374] Due to the removal of all commercial barriers and obstructions and a good and convenient channel of export, such as the Vistula was, Poland’s commerce grew by leaps and bounds, bringing unprecedented prosperity to the country.