Explore details about location Twelfth Line Dummer Road. Twelfth Line Dummer Road is a location situated within the Ontario alongside other areas such as Government Road W, Highway 17 (Trans-Canada), Hummingbird Crescent. Additionally, some smaller parts of Twelfth Line Dummer Road include specific areas like Highway 7, Belmont Township 11th Line, Simpson Road adding to the diversity of its landscape.