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821 Cranes and Derricks Safety II
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Types of Signals

Audible Signals

These are signals made by a distinct sound or series of sounds, such as sounds made by a bell, horn, or whistle. As with other types of signals, the signal person and operator must clearly understand the meaning of the signals being used.

New Signals

The standard allows room for development of new signal technology by permitting signals other than hand, voice, or audible signals to be used where the employer demonstrates one of the following:

  • The new signals provide at least equally effective communication as voice, audible, or Standard Method hand signals.
  • The new signals comply with a national consensus standard that provides at least equally effective communication as voice, audible, or Standard Method hand signals.

Knowledge Check Choose the best answer for the question.

2-4. During crane operations, new signals must provide communications that are at least equally effective as _____.