The Ministry of Transportation of Ontario (MTO) is the provincial ministry of the government of Ontario which is responsible for transport infrastructure and related law in Ontario. The ministry traces its roots back over a century to the 1890s, when the province began training Provincial Road Building Instructors. In 1916, the Department of Highways (DOH) was formed and tasked with establishing a network of provincial highways. The first was designated on 1918, and by the summer of 1925, sixteen highways were numbered. In the mid-1920s, a new Department of Northern Development (DND) was created to manage infrastructure improvements in northern Ontario; it merged with the DOH on April 1, 1937. In 1972, the Department of Highways was reorganized as the Ministry of Transportation and Communications (MTC), which then became the Ministry of Transportation in 1987.