[Tagging] traffic_signals:lanes? (specific signal types for certain lanes)

[Paul Johnson]

On Wed, Dec 27, 2017 at 4:04 AM, Tom Pfeifer <t.pfeifer at computer.org> wrote:
>
>
> As for your continuous green light, you might have always observed that it
> is on, maybe because you have never been there at a time when it might be
> off


In the US, where a light is continuous green, I've only ever seen it
implemented one of two ways:

   - The signal that has the continuous green only has one aspect.  The
   only way it's going dark is in a power outage or the bulb blows.
   - The signal is a three-aspect, but only the green is wired up, and
   there is a sign next to it that explicitly says "This light is always
   green".

I've also seen lights that are continuous red, again, only in two different
ways:


   - The signal that is continuous red is two aspect, the top one is steady
   and the bottom one has a blinker bulb; a sign indicates that you may only
   turn right on flashing red after stopping or no turn on steady red.  The
   only signals I knew that did this has been replaced by a stop sign and a
   right turn only sign.
   - The signal is a red globe and has a right turn only sign or a sign
   that reads "This light does not turn green."  This only makes sense where
   right turn on red after stop is a thing that exists.
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