Message from discussion Devices on lamp-posts

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From: Phil Chung <pylch...@gmail.com>
Newsgroups: cam.misc
Subject: Devices on lamp-posts
Date: Mon, 10 Mar 2008 09:53:13 -0700 (PDT)
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Some devices have been cropping up on some lamp-posts in my street and
neighbouring streets.  The devices look like cylindrical devices,
mounted vertically on the side of the lamp-post, with a upturned dome
at the bottom end.  This device is connected to a box, also on the
lamp-post.  An aerial comes out of the box.  the aerial's on a long
pole and looks like the ones on some of the electronic displays for
available car parking places around the city.

I always thought they maybe cameras, but these devices are in a quiet
cul-de-sac (Arbury Park end of Histon Road).  Anyone know what they
are?  I have only noticed them there very recently.