Where it appears to a highway authority, after such consultation with such owners and such occupiers of agricultural land as the highway authority consider requisite, that a cattle-grid provided under this Act for a highway for which they are the highway authority is no longer required, the authority may remove the cattle-grid and any gate or other works on the highway which have been provided for use in connection with it, making good the site thereof.
Where a by-pass has been provided for use in connection with a cattle-grid and the highway authority remove the cattle-grid they may direct that the by-pass is to be discontinued, and where they give such a direction they may remove all or any of the works provided for the purposes of the by-pass.
If a direction under subsection (2) above so provides, then as from such date as may be specified in the direction the public right of way over the by-pass shall be extinguished.
Where a by-pass or any part of one has been provided along an existing highway, then—