Final answer:
The acronym STOP reminds drivers to Stop Driving, Take a break, Observe their body's needs, and Proceed with caution when they start feeling tired behind the wheel.
Step-by-step explanation:
The acronym that is often used to remind drivers what to do at the first sign of getting tired while driving is STOP, which stands for Stop Driving, Take a break, Observe your body's needs, and Proceed with caution. When you feel yourself getting drowsy, it's a signal that you need to take immediate action to prevent a dangerous situation. The best practice is to pull over safely to a rest area or parking lot, take a short nap, stretch, grab a snack or a drink, get some fresh air, and only continue driving when you are feeling fully alert.