15.1.20. As far as practicable earth-moving equipment should not be left on highways at night. 15.1.21. If earth-moving equipment is left on a highway it should be adequately marked with lanterns, red flags or other effective means.
15.1.22. Unauthorised persons should not be conveyed on
earth-moving equipment.
15.1.23. No adjustments, maintenance work or repairs should
be made on equipment in motion.
15.1.24. Deck plates and steps should be kept free from oil, grease, mud or other slippery substances.
15.1.25. Dredge-type excavators should not be used on earth walls more than 1 m (3 ft 3 in) higher than the reach of the excavator if they are installed at the bottom of the wall.
15.1.26. Bucket excavators should not be used at the top or bottom of earth walls with a slope exceeding 60°.