The market place was the only road in the Upper Town which was surfaced. The surfacing and constant maintenance of the market place came at a cost so that the town was entitled to demand a so-called cobble-tax for entering the market place. The toll paid depended on the size of the cart and the number of draught animals. The small blue building in front of the Lower Gate was where the toll collector lived and worked. He stood below the projecting structure supported by four wooden pillars and collected the toll from the drivers.