Road structures include those parts that span the entire road width or cover traffic lanes, such as upper chord members of arch/truss bridges, and entrances of snow sheds and tunnels. In cold and snowy Hokkaido, snow and ice can accrete to these parts and, due to traffic vibration and/or a rise in temperature, may subsequently fall, potentially causing accidents and injuries. In recent years, various measures have been incorporated into the design of road structures to help prevent such accidents and injuries from occurring. Although snow removal operations are undertaken, snow that has accreted to the higher parts of bridges, for example, is extremely difficult to remove. In this paper, the findings of our observation of snow and ice accretion on bridges will be described, and cases of measures to prevent snow and ice accretion on bridges attempted in the past and the results will be discussed. Additionally, based on the results of our outdoor experiments on snow accretion/falling using bridge members, important points for the prevention of snow and ice accretion will be proposed.