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From: Doug Jewell on 26 Jun 2010 16:44
Did a run to Brissy yesterday. In the morning on the way
down I thought the new illuminated speed signs on the Ippy
M'Way were brilliant (pun not intended) - easy to see and
well placed (unlike QT's normal placement where they are
easily obscured).

Coming back late at night though, I found them to be quite
dazzling. There are a couple of spots with traditional signs
at roadside and IL signs overhead, and I found that I could
read the traditional sign from a hell of a lot further away
than I could read the IL. The IL was too bright for my night
vision and turned into a blur from a distance - only when we
were almost to it did it become readable. The missus (who
doesn't need glasses and has very good eyesight) observed
the same thing.

Has anyone else experienced similar? I believe they need to
be dimmed somewhat at night, which they don't seem to do.

--
What is the difference between a duck?
From: atec7 7 ""atec77" on 26 Jun 2010 23:03
Doug Jewell wrote:
> Did a run to Brissy yesterday. In the morning on the way down I thought
> the new illuminated speed signs on the Ippy M'Way were brilliant (pun
> not intended) - easy to see and well placed (unlike QT's normal
> placement where they are easily obscured).
>
> Coming back late at night though, I found them to be quite dazzling.
> There are a couple of spots with traditional signs at roadside and IL
> signs overhead, and I found that I could read the traditional sign from
> a hell of a lot further away than I could read the IL. The IL was too
> bright for my night vision and turned into a blur from a distance - only
> when we were almost to it did it become readable. The missus (who
> doesn't need glasses and has very good eyesight) observed the same thing.
>
> Has anyone else experienced similar? I believe they need to be dimmed
> somewhat at night, which they don't seem to do.
>
You are correct , it was suggested but the spending of another $42.00
was " out of budget" apparently
From: Kev on 27 Jun 2010 07:44
Doug Jewell wrote:
> Did a run to Brissy yesterday. In the morning on the way down I thought
> the new illuminated speed signs on the Ippy M'Way were brilliant (pun
> not intended) - easy to see and well placed (unlike QT's normal
> placement where they are easily obscured).
>
> Coming back late at night though, I found them to be quite dazzling.
> There are a couple of spots with traditional signs at roadside and IL
> signs overhead, and I found that I could read the traditional sign from
> a hell of a lot further away than I could read the IL. The IL was too
> bright for my night vision and turned into a blur from a distance - only
> when we were almost to it did it become readable. The missus (who
> doesn't need glasses and has very good eyesight) observed the same thing.
>
> Has anyone else experienced similar? I believe they need to be dimmed
> somewhat at night, which they don't seem to do.
>

Think it's bad in a car, imaging how much brighter they are whe you are
6-8 foot higher

yes they are too bright for night time
a simple light detecting diode system as fitted to the street lights is
all it would take to trigger, but they would probably need a sign with
two sets of LEDs to work reliably. Of course making such a sign that
complies with the criteria for lit speed signs would make them more than
twice as expensive


Kev
From: Bernd Felsche on 27 Jun 2010 12:49
Kev <kevcat(a)optunet.com.au> wrote:
>Doug Jewell wrote:

>> Did a run to Brissy yesterday. In the morning on the way down I thought
>> the new illuminated speed signs on the Ippy M'Way were brilliant (pun
>> not intended) - easy to see and well placed (unlike QT's normal
>> placement where they are easily obscured).

>> Coming back late at night though, I found them to be quite dazzling.
>> There are a couple of spots with traditional signs at roadside and IL
>> signs overhead, and I found that I could read the traditional sign from
>> a hell of a lot further away than I could read the IL. The IL was too
>> bright for my night vision and turned into a blur from a distance - only
>> when we were almost to it did it become readable. The missus (who
>> doesn't need glasses and has very good eyesight) observed the same thing.

>> Has anyone else experienced similar? I believe they need to be dimmed
>> somewhat at night, which they don't seem to do.

>Think it's bad in a car, imaging how much brighter they are whe you are
>6-8 foot higher

>yes they are too bright for night time
>a simple light detecting diode system as fitted to the street lights is
>all it would take to trigger, but they would probably need a sign with
>two sets of LEDs to work reliably. Of course making such a sign that
>complies with the criteria for lit speed signs would make them more than
>twice as expensive

Pulse-width modulation of LED is an effective and cheap way of
altering their brightness. The modulation frequency has to be high
enough so that the pulsing is not apparent in peripheral vision.

Some of the sign's LED can also be used to determine ambient light
levels; if there's a suffiently-long "off" phase in the cycle.
--
/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
\ / ASCII ribbon campaign | For every complex problem there is an
X against HTML mail | answer that is clear, simple, and wrong.
/ \ and postings | --HL Mencken
From: Albm&ctd on 30 Jun 2010 22:34
In article <LczVn.591$vD2.163(a)news-server.bigpond.net.au>,
georgewfrost(a)gmail.com says...
> a lonely country road
>
That road needs a friend.. maybe a footpath.

Al
--
I don't take sides.
It's more fun to insult everyone.
http://kwakakid.cjb.net/insult.html
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