LED light bar for optical traffic control systems

Details LED light bar for optical traffic control systems LED light bar for optical traffic control systems

2009-04-09

2011-12-06

Nguyen, Tai T (Department: 2612)

Communications: electrical

Visual indication

Using light emitting diodes

C340S815530, C340S003700, C340S003100, C315S035000, C315S082000, C315S18500S, C345S031000, C345S082000, C362S249020, C362S253000, C362S362000, C362S545000

Reexamination Certificate

active

08072346

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.

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