It shows the signals used by crane rigger, in addition to knowing the safety systems and preventive measures against tipping and electrical risk to use in the cranes.

Within the signs shown we have:

Use the main hook

Use the auxiliarDragon VS Tiger Tricksy hook

Climb or hoist

Go down

Lift the pen

Download the pen

Raise the boom and lower the load

Lower the boom and lift the load

Turn

Extend the boom (telescopic booms)

Retract the boom (telescopic booms)

Extending the pen

Retract the pen

Move slowly

Stop

Emergency stop

Displacement (a caterpillar)

Displacement (both caterpillars)

Displacement

Secure everything