Where a highway maintainable at the public expense comprises both a footway or footways and a carriageway, the highway authority may vary the relative widths of the carriageway and of any footway.

Where any part of a highway is carried by a bridge over a railway, canal, inland navigation, dock or harbour or forms the approaches to such a bridge, the powers conferred by this section shall not be exercised in relation to that part without the consent of the railway, canal, inland navigation, dock or harbour undertakers concerned.

A consent required by subsection (2) above shall not be unreasonably withheld, and any question whether the withholding of such consent is unreasonable shall be determined by the Minister.