There are several different types of Proximity Warning System, in general these system are designed to prevent vehicles colliding with objects and/or personnel. There are several different technologies used in proximity warning systems, the reversing sensors found on many modern cars can be considered a basic proximity warning system and use ultrasonic technology.
Site Zone is a Radio Frequency Identification (RFID) based Proximity Warning System, using RFID based systems has several advantages over other technologies.
The system will only detect the transponders (sometimes called tags) that it is designed to detect which reduces false alarms and maintains system integrity.
RFID based systems are not restricted to line of sight and can "see around" blind corners or obstacles such as stockpiles
The same technology can be used for a range of different applications in the same environment e.g. access control