In the testing literature, the term load testing is usually defined as the process of exercising the system under test by feeding it the largest tasks it can operate with. Load testing is sometimes called volume testing, or longevity/endurance testing.
Keep your taste buds awake, drink an energy drink. This may raise your level of alertness for a reasonable amount of driving time. Suck or munch on an apple, orange, or even a lemon to keep taste buds awake. The more tangy the food item the better. (Pull over somewhere safe before eating anything that you can't just pop in your mouth, however.
Always Stay Focused. When you're on the road, it's important to stay focused of the task at hand. If you choose to use your cell phone while driving, you stand the chance of causing an accident. If you need to, place your cell phone in the glove box, center console, or trunk to keep from reaching for the device.