Looking at the automobiles and their equipment today it can be seen that the majority of cars have already a navigation system on board. However, these devices may not only be used for navigation purposes, but also perhaps as a system for displaying traffic signals inside the car. In order to realise that, many technical and non-technical issues and aspects have to be discussed and thought about, thus ensuring a safe and secure system. Telematic Services are very useful services and their value is increasing with the idea of displaying traffic signals only inside the car and not on the road...