>In article <01bc7988$44b8b4c0$cad13fcb@krel4203.semex.net.au>,
> "Krel" <krel4203@netconnect.com.au> wrote:
>> We cannot even agree on what a Green over Red signal
>>indicates. States that use speed signalling like SA and Vic cannot agree on
>>what Medium Speed is.
>>
>As far as I know, the Medium Speed indications in SA and Vic are the same,
>i.e. yellow over green, except for the Adelaide suburban area, where the
>British system of a Flashing Yellow is used.
>However, Low Speed indications do differ in that SA allows a Clear Low Speed
>whereas such an indication is very rare in Vic. Again the Adelaide suburban
>area is different.
> Cheers,
> John McCallum
> e-mail address: mccallum@melbpc.org.au
> Phone 03 9478 4254. Member, Melbourne PC User Group.
>And they were both naked, the man and his wife, and were not ashamed.
>(Genesis 3,25)
One of the aspects of signalling where 2 color light signals are used as in
VIC,SA and WA is the concept of a home signal or even an automatic signal
displaying green over red for clear normal speed.
What information is the lower red light supposed to be conveying under
these conditions.In NSW home signals display green over green or simply a
single green for clear normal speed which makes a bit more sense.
Its reasonable to display multiple red lights for home or automatic signals
where the lights are vertically staggered,but it seems a bit silly to display
red lights for clear.
Anyone know the history or logic if any of these indications?
Also is there any differances in interpretation between a red over red
indication and a single red,ie single color light signal with no lower
light,as the down departure signal at Sunbury displays.?
cheers
MD
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Maurie Daly
Department of Communications Lab.
Canberra
Australia
mauried@commslab.gov.au
ph 6 2791331
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