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 yes, they are ""controlled-access highways"" 
I'm the one that bothered to find the statute, of which you were ignorant, and yet you try to lecture me on statutory construction?  Let me know when you've argued a couple cases before the US Court of Appeals, or even a state Court of Appeals, and then I'll take you a little more seriously.

The parts that you left out were:

Definitions

1.  In this Act,
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""highway"" includes a common and public highway, street, avenue, parkway, driveway, square, place, bridge, viaduct, trestle or any other structure incidental thereto, any part of which is intended for or used by the general public for the passage of vehicles and includes the area between the lateral property lines thereof; (""voie publique"")
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PART II
CONTROLLED-ACCESS HIGHWAYS

Controlled-access highway designation
36.  (1) The Lieutenant Governor in Council may designate any,
(a)    highway; or
(b)    proposed highway,
as a controlled-access highway and every highway so designated shall be deemed to be part of the King’s Highway and the provisions of this Act and the regulations that apply to the King’s Highway apply with necessary modifications to such controlled-access highway.

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The other sections of the Act are entitled:

PART III
SECONDARY HIGHWAYS

Secondary highways, designation
40. The Lieutenant Governor in Council may designate any highway as a secondary highway and thereupon Part I and all the other provisions of this Act and the regulations that apply to the King's Highway apply with necessary modifications to such secondary highway.  R.S.O. 1990, c. P.50, s. 40.

PART IV
TERTIARY ROADS

Tertiary roads, designation
41.  (1)  The Lieutenant Governor in Council may designate an existing road that is in whole or in part in territory without municipal organization as a tertiary road, and thereupon the provisions of this Act and the regulations that apply to the King's Highway, except sections 33 and 34, apply with necessary modifications to such tertiary road.  R.S.O. 1990, c. P.50, s. 41 (1).

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They are all King's Highway  even tertiary (dirt) roads.
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