Quote:
Originally Posted by Jay911
Here's a closeup of an Opticom receiver.\
The sensors are in the large(r) black housing of the device itself - the long flute-like shields prevent flashes from cross-traffic from triggering the light for the wrong direction.
I'm not sure why this model has 2 flutes. Maybe one is visible light and one is IR.
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Don't know why there are two, either. The old style (from the 1970s - 3M's Opticom ain't new) sensors were smaller and had one "sight" facing each direction and looked much more like a rifle sight.
Looks like 3M sold the product line:
Opticom IR
They were originally visible light, but I've only seen IR in the last decade.
In Chicagoland, they add a white light next to them. Solid in one direction, flashing in the other. That way apparatus approaching from different direction know who "has control" of the intersection.