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Jason210Flag for Sweden

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Signal Systems for the office

We have these red-lights outside of some of our rooms that we can turn, that say "engaged". Are there any more sophisticated systems, like miniature traffic lights, that can be mounted outside a room, where like "green" means enter, etc?
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Sure!  Put underwear on the knob, people will get it.
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Thanks all, and good point Robin.
This is actually for a lecture room, that does courses in computer software. Sometimes, there can be a class in there just working on exercises, and then it's ok to knock and enter. At other times, there may be a lecturer in there doing a tutorial with the students - in which case it's not ok to knock - anything like that disrupts the class. I thought of a red and green light.
Just a notice' Quiet please! Class in Progress'.
Otherwise you are in danger of modernising just for the sake of it and missing out important information as you do it. The important thing here is to keep people away and inform them why.
A coloured light can mean anything, perhaps that a system has failed inside the room and needs investigating. So you need a notice to explain the light, and you need it in a prominant place like fastened to the door. So now it's a two stage process instead of just one.