Do not drive when you are tired. You might fall asleep while driving, risking your own life and the lives of others on the road. Even if you do not fall asleep, fatigue affects your ability to perceive and react to emergencies. Your thinking slows down and you miss seeing things. In an emergency, you may make the wrong decision or you may not make the right one fast enough. It is also important not to drive when you are upset or angry. Strong emotions can reduce your ability to think and react quickly. Be especially careful not to fall victim to road rage, or you could find yourself in a vulnerable and dangerous position.