An authorised person in the discharge of any of his functions under this Act may, after reasonable notice-

(a) enter, inspect and survey any land or premises;

(b) excavate the subsoil and open, construct or repair any road, tunnel, sewer, drain or other works relating to a trunk road;

(c) specify levels, boundaries and lines by placing marks and digging trenches;

(d) remove or cut branches of any tree or underwood;

(e) with the prior approval of the Minister alter the course of any river, stream or watercourse for the purpose of constructing and maintaining any trunk road;

(f) stop, divert, widen or narrow temporarily or permanently, the course of any river, stream or watercourse or any road, street, way, bridge or ferry or raise sink their level;

(g) take, haul and use any earth, stone, gravel, sand or timber or any other material or thing out of any land contiguous to any road camp which may be necessary for making, maintaining, altering, repairing or for the use of the road, bridge, ferry or road camp;

(h) exercise any right of way or entry already acquired or paid for and demolish any encroachments on such land, without payment of any further compensation except as provided by the Lands (Statutory Wayleaves) Act, 1963) (Act 186);