Terron Microsystems supplies Voice Announcement System for Roadway Vehicles. Terron Microsystems offers GSM, GPS and microprocessor / microcontroller based systems. Voice Announcement System for Roadway Vehicles is a state of the art integrated passenger information server system using global positioning system technology. Voice Announcement System for Roadway Vehicles has an integrated GSM/GPRS interface that transmits the location of the bus to a central server. This system is used with mapping solutions; the system seamlessly integrates with modern central monitoring stations.