Certain medications saygt;gt;gt;Do not drive or operate machinerylt;lt;lt;lt;What kind of machinery are they talking about?
Anything that could hurt you or others if your reaction time is slowed, or your judgement is impaired - bulldozers, table saws, drill press, crane, threshers, etc. etc. etc. Easier to say machinery.
Anything which requires hand and eye coordination or which would be unsafe if you had slow reflexes.
Anything you drive, or a machine that you cut. Anything that could cause major injury because you weren't alert enough.
