Michael:
I forgot to mention that a hot filament is much more susceptible to early
failure from vibration and trauma than a cold filament, especially on 24
volts. In other words unnecessary operation increases replacement costs
significantly on the above grounds alone, let alone chewing through the
500-600 hours design life of 24 volt headlights.
And I'm sure you've realised that given Australia's high ambient light
levels, daytime running lights would most likely have to be brighter than
the ones in Sweden to be seen.
And of course there's the matter of contrast between the light and a light
coloured, brightly lit landscape to consider.
Exempting heavy vehicles on the reasonable grounds that their large frontal
area makes them easy to see anyway, compared with the increasingly low
frontal area of low drag coefficient cars would be a step in the right
direction for any such daytime running lights proposals, but we would still
be sceptical of their value in Oz, even for cars.
Regards,
Bob Murphy
IS Edit Transport & Technical Communications
PO Box 111
Campbells Creek VIC 3451
AUSTRALIA
Tel: +61 3 5476 4408
5476 4474
Mobile: 0428 312 116
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----- Original Message -----
From: "Michael Paine" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, September 06, 2002 8:02 AM
Subject: Daytime running lights
> I am undertaking a research project on the possible encouragement of
> daytime running lights in Australia. I am interested in studies of
> effectiveness, technology (eg dimmed high beam Vs low beam Vs dedicated
> lamps), visual ergonomics, running costs and availability from OEM and
> aftermarket suppliers.
> There are numerous studies of the effectiveness of DRL in high latitude
> countries. Peter Cairney from the Australian Road Research Board
> published some research on the case for DRL in Australia during the
> early 1990s and that is most useful. However I am interested in studies
> that may have been carried out since then - particularly the potential
> of "new" technology. For example GM in the USA apparently equip many of
> their vehicles with dimmed high beam headlights for daytime use. Peter
> Bergkvist from GM presented an excellent ESV paper on that initiative.
>
> Any advice, links or contacts you could provide would be appreciated.
>
> If you would prefer to email me directly please click on this link:
> mailto:[log in to unmask]
> Otherwise your reply will be circulated on RTT.
> regards
> Michael Paine
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