IST International, Ltd.
- Manufactures intelligent signaling systems.
- http://www.intelligentsignals.com/

Precision Solar Controls, Inc.
- Manufactures traffic monitors, signal lamps, and solar powered changeable message signs.
- http://www.precisionsolarcontrols.com/

P. Berghaus GmbH
- Manufacturers of traffic signal systems for roadworks, beacons, mobile warning trailers, warning lamps, protective equipment and guide elements.
- http://www.berghaus-signalbau.de/

Lingo Industrial Electronics
- Distributors of traffic signal and street lighting products and related accessories.
- http://www.lingoindelectronics.com/

Alstom Signaling, Inc.
- Supplier of components, systems and services for train controls and signaling systems.
- http://www.alstom-sig.com/

ActOne1 Communications
- Indoor, outdoor, mobile, and traffic signal LED message boards and displays.
- http://www.actone1.com/

Union Switch & Signal, Inc.
- Manufactures signaling, automation, and control equipment and systems for the railroad and mass transit industries.
- http://www.switch.com/

Traffic Signals Controls, Inc.
- Traffic control systems and related equipment and services.
- http://www.trafsig.com

Lights To Go
- Traffic light controls and signal flashers for collectable and automobilia enthusists.
- http://trafficlights.com

Pelco Products, Inc.
- Manufacturer of traffic signaling hardware.
- http://www.pelcoinc.com/