ACS Lite from Siemens
ACS Lite is an adaptive control software application that has been developed as a closed-loop system by Siemens under contract to the FHWA Research, Development and Technology Traffic Operations Program. It may be deployed as an on-street field master or on a central server.
The ACS Lite software is designed to adapt the splits and offsets of signal control patterns/plans in a “closed-loop” system. Changes to cycle time are handled on a time-of-day schedule like traditional traffic control systems. At each optimization step, which occurs about every 10 minutes, the system changes the splits and offsets a small amount (e.g. 2-5 seconds) to accommodate changes in traffic flows.