The province of Ontario does not have a single unified network of controlled-access highways or freeways.
Although most freeways are part of the 400-series highways, which can be characterized by their high design standard, several other sections of provincial highways are also classified as freeways.
Additionally, several controlled-access highways, called municipal expressways, are maintained by municipalities rather than the provincial government like provincial highways are.
[1][2][3] The MTO defines a freeway as a divided highway with at least two lanes in each direction.
Municipal expressways are controlled-access highways not under the jurisdiction of the provincial government.