Distributed input/output subsystem for traffic signal control. Final report, December 1993-May 1995
The `distributed input/output sybsystem` is an electrical interface between a traffic device controller, its sensors (typically loop detectors), and its actuators (typically signal lamps), Spread-spectrum signals from the controller are carried over a pair of 110VAC wires that supply power to the devices. Control modules at the actuators decode these signals and implement only the commands that are addressed to their devices. The process also works in reverse for sensors, using the same hardware elements. This interface greatly reduces the quantity of wiring installed at traffic signals and can be easily expanded to accommodate additional sensors and actuators. This can substantially reduce labor and material costs. This project demonstrated distributed control modules for several ITS applications: traffic signal lamps, ramp meters, loop detectors and variable message signs.
- Research Organization:
- Transportation Research Board, Washington, DC (United States)
- OSTI ID:
- 273694
- Report Number(s):
- PB-96-187273/XAB; CNN: Contract DTFH61-92-X-00026; TRN: 62122671
- Resource Relation:
- Other Information: PBD: 1 Jul 1995
- Country of Publication:
- United States
- Language:
- English
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