Agricultural Hand Signals
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Voice communications are impossible in certain agricultural situations due to distance and noise. For this reason, standard Agricultural Hand Signals have been developed for farm machinery operators by the American Society of Agricultural Engineers. Hand signals can prevent accidents and save time. Use them and teach others to use them. Learning this new "language" will give you an easy and effective way to communicate when working around or with machinery.
Archive version. For the most recent information see extension.missouri.edu.