In real life, workers often communicate with hand gestures, particularly on construction sites, in factories, train stations, airports and other noisy environmnets.
VR systems with 6DoF tracking allow us to use physical hand gestures within the VR simulation as an input that triggers certain actions. This allows training simulations to include some gestures (e.g. hand wave) as part of the training.
User signals with hand to a vehicle, that they can proceed with their part of the task