[Tagging] Remote controlled devices

Bryce Nesbitt bryce2 at obviously.com
Fri Nov 1 19:38:44 UTC 2013

On Sun, Oct 27, 2013 at 2:31 PM, François Lacombe <
francois.lacombe at telecom-bretagne.eu> wrote:
> there are also objects that can be influenced remotely, like busses that
>> can put certain traffic_lights to green
> Actually I'm not sure we can talk about remote control in this situation.
> Because buses won't directly turn traffic lights green. A third part
> (computer, industrial processing unit...) will know the bus is coming and
> adapt lights following a few rules.

The most common system is the 3M opticom, where coded infrared light is
transmitted from
the bus or emergency vehicle, to a sensor mounted on the traffic light.
 The traffic control computer (located in
a box nearby) then adjusts the light as needed.  Typically it calls for 4
way red when an emergency vehicle approaches,
and delay or advanced green for high priority vehicles like a bus.
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