Final answer:
When operating a forklift and approaching a blind corner, it is important to slow down and sound the horn before proceeding.
Step-by-step explanation:
When operating a forklift and approaching a blind corner, the correct action to take is to slow down and sound the horn before proceeding. This is important because it alerts anyone on the other side of the blind corner that a forklift is approaching. Slowing down allows the driver to have better control and reaction time in case there is a hazard or someone unexpectedly coming around the corner.