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Question:

To prevent drowsiness when you're driving on an interstate highway, you should

A
Explaination

To prevent the onset of drowsiness when you're driving on an interstate highway, keep shifting your eyes from one area of the roadway to another and focusing them upon various objects near and far, left and right. Talking on a cell phone or changing lanes frequently can be dangerous. However, if you become drowsy anyway, stop and take a rest break.