A Ministry of Natural Resources (MNR) Road Barrier is when access to a road segment or network is restricted or controlled. Road authorities in Ontario have the mandated responsibility to construct roads or have them constructed on their behalf. They include: * Ministry of Natural Resources (resource access roads and park roads) * Municipalities * Ministry of Transportation * Ministry of Northern Development and Mines * Federal government (roads on federal lands, e.g. national parks, Dept. of Defense) * First Nations * Other, e.g., local roads boards This product requires the use of geographic information system (GIS) software.