The use of the car is an integral part of the everyday life of many people. As most people spend more time in the car, the number of accidents has also risen in recent years. Globally, traffic accidents are the most common cause of death. Although vehicles are becoming safer and safer, many accidents are caused by driver carelessness or distraction. However, supposed secondary activities in everyday driving behavior can have fatal consequences. Driving while using the phone is one of the few secondary occupations that is prosecuted in Germany and the USA. This master's thesis examines risk factors that distract the driver while driving. The participants are questioned in a survey to make general statements about driving behavior. In a driving simulation experiment, the effects of the distracting behavior while driving are investigated. In detail, the influence of the main factors Hand-on-Wheel, Background-Noise, Weather and the interaction of these main factors on driving performance will be investigated. Ultimately, the experiment proved that even seemingly insignificant secondary occupations influence the driver's driving performance. Even if some main factors did not affect driving performance alone, all the factors analyzed in combination with another main factor compromise driving performance. iii Acknowledgement First of all, I want to thank my committee members, specifically my advisor Professor Jyh-Hone Wang for their personal support, helpful suggestions and constructive criticism during the preparation of this Master's thesis. Furthermore, I want to thank Sanaz Motamedi for her help and guidance with my study. Also, I have to thank my friend and lab neighbor Alaa Masrahi for his constant helpfulness, our fruitful discussions, his motivation and the pleasant working atmosphere around the clock. Then, I want to thank my new American friends and fellow German students who came with me to Rhode Island, who all supported me with a lot of patience, interest and helpfulness during my thesis and with whom I had a great time studying. And finally, I would like to express my heartiest thanks and gratitude to my family and particularly my parents. They made my study possible and always supported me morally