Patent · US Active

LED light bar for optical traffic control systems

US8072346B2 · kind B2 · utility

11Cited by
11References
21Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 9, 2009
Grant dateDec 6, 2011
Priority date—
Expiry dateDec 20, 2029

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG08G1/087
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

Various approaches for activating a traffic control preemption system. A light bar includes a support structure and a plurality of LED modules individually mounted on the support structure. Each LED module includes a plurality of LED groups, and in at least one of the plurality of LED modules, at least one LED group in the module is an infrared (IR) LED group, and at least one LED group in the module is a visible light LED group. A controller is coupled to each module. The controller is configured to trigger an IR light pulse pattern at a first level of IR radiant power from the at least one IR LED group. The pulse pattern and first level of IR radiant power activate preemption in a traffic control preemption system.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.