A cattle-grid provided under this Act for a highway, a gate or other works on a highway provided for use in connection with such a cattle-grid, and any works provided for the purposes of a by-pass provided under this Act, are maintainable by the highway authority for the highway.

A by-pass provided under this Act shall, unless and until the highway authority give a direction discontinuing the bypass, in all cases be a highway which for the purposes of this Act is a highway maintainable at the public expense for which that authority are the highway authority.