Don’t turn on red. The purpose of the word on is to complete the meaning of the sentence, which is Don’t turn when the traffic light is red. ) Without on , the sentence orders you not to change to the color red!
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erikandre"Don't turn on red" What's the purpose of the preposition "on" there?Without it the sentence would be "Don't turn red", which means something completely different, namely, "Don't blush (with shame or embarrassment)".