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Local Intelligence Unit


The Local Intelligence Unit (LIU) is a programmable device that can run custom traffic control algorithms. LIU provides a state-of-the-art solution for traffic control and lets you take control of your traffic.

The LIU is a compact (3U) programmable hardware platform designed to be installed in and interface using TR2523 requirements with traffic signal controllers. It comprises of a processor card and an I/O card. Users can implement their own traffic control logic solutions onto the process, written as scripts written in Perl. Using the IO card or serial interfaces these scripts can access local data from the traffic controller and detectors and drive outputs or send commands. They can also support an Ethernet port to connect remotely. The LIU can also be used as a local data logger to capture traffic data to its microSD card.

The LIU I/O card is available either with 8 inputs & 8 outputs or with 48 inputs and 16 outputs. Connection is simplified by a standard 8 way loom. Users install only as many looms as needed to connect their unit. Powered at 24V D.C. (<2W) the LIU can run either from the controller’s own internal power supply or a separate supply. 

A sample list of applications where LIU already provides a cost-effective solution includes:
Bus priority and compensation
  • Customised VA logic
  • Control logic using selective vehicle detection. E.g. classification, from advanced detectors.
  • User defined plan switching logic
  • Selective vehicle detection and priority
  • Custom logic for complex junctions
  • Traffic monitoring and real-time alerting
This is by no means an exhaustive list. Please contact us to discuss your requirements. Regardless of the unique nature of your traffic problem, the LIU can help you achieve your goals.