When backing with the assistance of an outside guide, both the driver and helper must agree on hand signals beforehand, most importantly a clear signal for 'stop'.
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True
Commercial driver safety standards require that before initiating an assisted backing maneuver, the driver and spotter must agree on hand signals they both understand, with an agreed-upon signal for 'stop' being paramount.
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Key Concept
Pre-maneuver communication and hand signal agreement with a backing helper