Goods were transported to local markets over roads that were sometimes little more than widened Indian trails. Towns were required to maintain their roads, on penalty of fines, and the colony required special town commissions to lay out roads in a more sensible manner in 1639. Bridges were fairly uncommon, since they were expensive to maintain, and fines were imposed on their owners for the loss of life or goods if they failed. Consequently, most river crossings were made by ferry. Notable exceptions were a bridge across the Mystic River constructed in 1638, and another over the Saugus River, whose upkeep costs were subsidized by the colony.