It looks rather like the Bluetooth devices installed in trams to pick up
passenger Bluetooth signals for travel pattern information. Z class tram
top right driver's bulkhead Mal if you haven't seen them before. They have
a diameter of maybe 6cm. I'm sure I've seen a QR code on some too.
Andrew.

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On Thu, 15 Oct 2020 at 16:22, Mal Rowe mal.rowe@...> wrote:

> On 15/10/2020 15:38, David Batho wrote:

> > I 'did good’, then! Would the double ones correspond with tram route

> > junctions, or ‘sections’ (if they still have them), or, maybe, a

> > terminus for a short working?

> >

> The one in Gordon St does not fit any of those options.

>

> I had a look at a local one today - pic attached.

>

> It has QR code which decodes to the number on the same label.

>

> I'll go back another time and see if I can get a pic of the label on the

> underside. I didn't notice it until I looked at today's pic.

>

> I'm pretty sure that they are sign posts for AVM, but have no idea why

> there are two in some places.

>

> Mal

>

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