GSM/ GPRS Based Vehicle Tracking System features two digital inputs, two analog inputs and one digital output. The Vehicle Tracking System is a messaging and location unit which uses GSM/ GPRS network and is integrated with GPS technology, which helps in getting the precise location of the vehicle. The Vehicle Tracking System locates the vehicle using GPS module and communicates the information of the location to the internet based monitoring software via GSM or GPRS services. GSM/ GPRS Based Vehicle Tracking System enables two way data transmission of voice or text between fleet managers and vehicle facilitating optimal routing.