In recent years, a lot of research has been done in the area of automated vehicles and Automatic Highway Systems (AHSs) and many others. All this research has a common goal: to make driving on today's highways safer and easier and also focused for race car accident prevention system. This paper reports a complete research work in accident emergency alert situation and emergency service provider. They were able to program a GPS/GSM module incorporating a crash detector to report automatically via the GSM communication platform, giving the exact position of the point where the crash had occurred. In this paper, messages on the network are classified and the identifier coding, data coding, network management mechanism and physical interface are defined.