The employer shall ensure at a construction site of a building or other construction work that,—
(a) an operator of a bulldozer before leaving such bulldozer,-
(i) applies the brakes;
(ii) lowers the blade and sipper; and
(iii) puts the shift lever into neutral;
(b) a bulldozer is left on level ground at the close of the work for which such bulldozer is used:
(c) the blade of a bulldozer is kept low when such bulldozer is moving uphill; and
(d) the bulldozer blades are not used as brakes except in an emergency.
91. Scrapers,- The employer shall ensure at a construction site of a building or other construction work that,-
(a) a tractor and scraper is joined by safety line at the time of its operation;
(b) the scraper bowls are propped while blades of such scraper are being replaced ; and
(c) a scraper moving downhill is left in gear;