Drowsy drivers:

Drowsiness can make people drive so poorly that they appear to be drunk. Opening a window, turning on the radio, or drinking coffee is not enough to make a drowsy driver alert to roadway hazards.

• Should drink strong black coffee to stay awake.
• Can drive so poorly that they may appear to be drunk.
• Can stay alert by opening a window and turning up the radio.
• Are usually only older drivers.