Doki typed:
>> Michael Green typed:
>>> A nearby stretch of road has aquired a large number of
>>> 'speed' cameras. There are two distinct types, the
>>> normal sort and another sort, distinguished by have two
>>> round windows, this sort have three parallel lines on
>>> the road instead of the familiar ruler road markings.
>>> What are they?
>>
>> They sound like 'SPECS' cameras which come in pairs and
>> average a drivers speed over a distance, rather than at a
>> particular spot. They really do have an effect on speed
>> reduction.
>
> The cameras the OP is talking about are Truvelos. Take
> your photo as you head towards the camera, speed is sensed
> with piezo strips on the road and the three parallel lines
> are used as a secondary check (distance that the tyre has
> travelled over the lines in between the two photos IIRC).
> Specs cameras look like security cameras with IR lamps
> either side, and are mounted on gantries high over the
> road. Generally a lot more than a pair IME (Nottingham),
> though they might just use pairs for things like
> roadworks.
OK, I guess you're right .. I couldn't remember any road
markings with the specs, but the 'round windows' description
reminded me of the IR lamps either side of the cameras.
I know the specs cameras in Nottingham .. ;( They work in
pairs for the speed calculation, but, as in Nottingham, they
tend to use them in quite a few locations around known
'trouble' spots.
--
Paul ...
(8(|) ... Homer Rocks