Frost's government oversaw great expansion in the role of government. Under his leadership, Ontario greatly expanded its schools, highways and hospitals. His government substantially increased public investment in the economy, as well as through strong fiscal policies. and under his leadership Ontario created the 400 series of superhighways, most notably the Macdonald-Cartier Freeway better known as Highway 401. His government also attempted to wrest control of the income tax from the federal government, but failed, resulting in the introduction of a provincial sales tax. The Frost government introduced public hospital insurance to the province which would be expanded by his successors to become the modern OHIP system of medicare.