On Thu, 12 Dec 2013 20:41:51 +0000
Roger Mills wrote:

On 12/12/2013 19:38, Davey wrote:
On Thu, 12 Dec 2013 19:12:58 +0000
wrote:

We're getting some new street lights and have noticed they have
little antennas on the top.

What is it for? They look like they have a light detetector same
as the old ones too.

Where I lived in the States, they were so that a speeding Police
Cruiser or Fire Engine could signal them on approach to turn green
in its favour.

Er . . the OP was asking about street lights, not traffic lights.

True. Senior moment.
--
Davey.