The OP said it was a requirement of the state agency he's in. And the
OP said he didn't know beyond that.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"Evan" wrote in message
...
On Nov 24, 11:35 am, Harry K wrote:


I haven't seen it mentioned and may have missed something here
but...

Aluminum is good priced scrap metal. Why not replace it with
galvanised iron/steel? Not much money in that and cheaper

Harry K


Because traffic signs (and therefore reflectors also) are made out
of aluminum sheet goods cut to whatever size and shape needed
for the specific application required and then a reflectorized
applique sheet which covers the entire surface is applied...

Galvanized steel would not last the years and years required of
a traffic sign... The applique graphics will fade from exposure to
the sun long before anything happens to the aluminum sheet
which would be recycled and made into other things... A sign
panel made of sheet steel would begin to rust even with a
coating on it...

~~ Evan