57.16016—Lift trucks.
Fork and other similar types of lift trucks shall be operated with the:
(a)
Upright tilted back to steady and secure the load;
(b)
Load in the upgrade position when ascending or descending grades in excess of 10 percent;
(c)
Load not raised or lowered enroute except for minor adjustments; and
(d)
Load-engaging device downgrade when traveling unloaded on all grades.