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CarGuru > Driving > New Yellow Color 16 March 2005 01:07:23
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New Yellow Color

Dave Cunningham 13 March 2005 05:25:13
 Hi all, new to group. Noticed in the last few years a different kind of
bright yellow on road signs. Best example is on WV turnpike for the large
"curve ahead 55mph" signs. Can anyone tell me what this colour is called or
where to find the specs for it?


Add comment
Sherman Cahal 13 March 2005 06:50:21 [ permanent link ]
 dave cunningham wrote:> Hi all, new to group. Noticed in the last few years a different kind
bright yellow on road signs. Best example is on WV turnpike for the
large> "curve ahead 55mph" signs. Can anyone tell me what this colour is
called or> where to find the specs for it?

It is a darker yellow hue. Here are my guidelines for the signs in WV
for guide signs (the large curve ahead signs fall under this):

Pre-2001: Button copy. Darker green/darker yellow hue.
2001-2004: Reflectorized. Light green/bright yellow hue. Unfortunately,
you could see outlines of the posts at night and the signs were
actually too bright at times.
2004: Darker green/dark yellow hue. Looks beautiful and reflectorizes
very well at night. These are what replaced the majority of the signage
along the interstates in Charleston and the WV TPK.

Kentucky also used the lighter green and bright yellow hues around 2001
to 2004, and now use the dark green/dark yellow hue, the same as West
Virginia.

Add comment
Marc Fannin 13 March 2005 23:55:22 [ permanent link ]
 dave cunningham wrote:
Hi all, new to group. Noticed in the last few years a different kind
bright yellow on road signs. Best example is on WV turnpike for the
large> "curve ahead 55mph" signs. Can anyone tell me what this colour is
called or> where to find the specs for it?

Sherman Cahal mentioned that Kentucky also uses it, and I've seen some
instances in Northeast Ohio.

The online Federal MUTCD has a color specification page online at
http://mutcd.fhwa.d­ot.gov/kno-colorspec­.htm
- note the links to the "final rule" dated 2002 - while I don't
understand all the technical aspects, I'm assuming that since that date
is generally when the darker yellow started appearing that the document
gives the new color standard.

___________________­____________________­____________________­_____________
Marc Fannin|musxf579@ken­t.edu or @hotmail.com| http://www.roadfan.­com/

Add comment
Argatlam Roads 14 March 2005 02:20:41 [ permanent link ]
 [Mr. Fannin:]
The online Federal MUTCD has a color specification page online at> http://mutcd.fhwa.d­ot.gov/kno-colorspec­.htm> - note the links to the "final rule" dated 2002 - while I don't> understand all the technical aspects, I'm assuming that since that
date> is generally when the darker yellow started appearing that the
document> gives the new color standard.

I have not observed a darker yellow used on warning signs and, in any
case, the main difference between the Final Rule cited above and
previous Rules on color specification is that there are now test values
for fluorescent colors. To quote from the Final Rule:

[begin quote]

The color regions in the final rule are not
significantly different from previously defined color regions and
should not be changed without substantial indication of inadequacy.

[end quote]

What I have observed, however, is that fluorescent yellow is being used
more often for warning signs. When I passed through in 2003, Colorado
was in the process of changing its warning signs on rural highways from
plain yellow (either enclosed lens/"engineer-grad­e" or
encapsulated-lens/"­high-intensity" sheetings) to the new fluorescent
yellow color. It is also becoming increasingly common to use
fluorescent yellow bottom panels on freeway guide signs. Fluorescent
yellow is very similar in hue to the plain yellow of the older
sheetings, but is much more conspicuous (I think because of greater
luminance). It is not to be confused with fluorescent yellow-green,
which is now approved for pedestrian crossing signs etc., with
fluorescent orange, which is increasingly being used for construction
signs in Canada, or with microprismatic yellow sheeting.

I am 95% certain the O.P. is asking about fluorescent yellow.

The growing popularity of fluorescent yellow has also occurred in
parallel with a shift toward microprismatic sheetings for the green
background on large guide signs. So, taking apart Sherman Cahal's
taxonomy of West Virginia freeway guide signs:

* Older, "darker" button-copy signs: the green background on these
signs is either not reflectorized or is enclosed-lens retroreflective
sheeting (the weakest kind). The yellow bottom panels are almost
certainly retroreflectorized,­ but not with anything stronger than
encapsulated-lens sheeting; enclosed-lens sheeting is more probable.

* Newer signs between 2001-2004: Encapsulated lens sheeting is
probably being used for sign background, legend, and yellow bottom
panels. Compared to enclosed-lens sheeting, encapsulated-lens sheeting
has a more silvery appearance--white is actually off-white, green is
lighter, etc. Contrast is lower, and differentiation among colors is
not as strong under ordinary lighting.

* Current signs: Microprismatic (sometimes called "high-performance")­
sheeting is probably being used for sign background, primary legend,
and yellow bottom panels. The color contrast one gets from
microprismatic sheeting is about the same as from enclosed-lens
sheeting, but the retroreflectivity is MUCH greater--greater than from
encapsulated-lens sheeting, in fact. Compared to encapsulated-lens
sheeting under ordinary daylight, microprismatic sheeting offers a
darker green, a whiter white, and roughly the same yellow. Most brands
of microprismatic sheeting I have seen can be recognized by a stippled
pattern in the reflected light which is immediately evident when the
sign is viewed obliquely under specular light (e.g., unblocked
sunshine).

I believe that the W.V. Turnpike 55-M.P.H. curve signs the O.P. asks
about use fluorescent yellow sheeting. That would be a logical choice
given the safety criticality of those curves (indeed, the majority of
Colorado's new fluorescent yellow warning signs are curve warning
signs). Aside from that, it appears that microprismatic yellow bottom
panels are being used on overhead guide signs.

Add comment
Sherman Cahal 14 March 2005 03:11:59 [ permanent link ]
 argatlam_roads@yahoo­.com.mx wrote:> [Mr. Fannin:]>
The online Federal MUTCD has a color specification page online at> > http://mutcd.fhwa.d­ot.gov/kno-colorspec­.htm> > - note the links to the "final rule" dated 2002 - while I don't> > understand all the technical aspects, I'm assuming that since that> date> > is generally when the darker yellow started appearing that the> document> > gives the new color standard.>
I have not observed a darker yellow used on warning signs and, in any> case, the main difference between the Final Rule cited above and> previous Rules on color specification is that there are now test
values> for fluorescent colors. To quote from the Final Rule:

The darker yellow is used for warning signs that are not school,
bicycle, or special vehicle warning signs (e.g. buggies). The MUTCD has
a rule stating which can be fluorescent yellow-green, which is hideous
IMO. There were even talks for a fluorescent red of all things. I have
seen the darker green and darker yellow hues used in Ohio,
Pennsylvania, West Virginia, and Kentucky so far, and IMO they look a
lot better and are much more visible.

The warning signs that the original poster stated were not 'fluorescent
yellow' at any respect. They were just a darker yellow. The
'fluorescent yellow' I surmise was the bright yellow against a bright
green background used on West Virginia highways after button copy fell
out of flavor until just recently. It was not as visible at night
because it reflected far too much light back.
What I have observed, however, is that fluorescent yellow is being
used> more often for warning signs. When I passed through in 2003,
Colorado> was in the process of changing its warning signs on rural highways
from> plain yellow (either enclosed lens/"engineer-grad­e" or> encapsulated-lens/"­high-intensity" sheetings) to the new fluorescent> yellow color. It is also becoming increasingly common to use> fluorescent yellow bottom panels on freeway guide signs. Fluorescent> yellow is very similar in hue to the plain yellow of the older> sheetings, but is much more conspicuous (I think because of greater> luminance). It is not to be confused with fluorescent yellow-green,> which is now approved for pedestrian crossing signs etc., with> fluorescent orange, which is increasingly being used for construction> signs in Canada, or with microprismatic yellow sheeting.

School, pedestrian and bicycle signs all use the fluorescent
yellow-green signage. All other signage using the fluorescent
yellow-green is illegal. See
http://mutcd.fhwa.d­ot.gov/HTM/2003/part­2/part2A.htm Section 2A.11 for
the chart.
I am 95% certain the O.P. is asking about fluorescent yellow.

Nope. Just a darker yellow hue. It is not fluorescent yellow in any
respect. The fluorescent yellow _might_ have been the bright yellow
signs (e.g. EXIT ONLY) on guide signs _only_ but those have been
discontinued for their visibility.
* Older, "darker" button-copy signs: the green background on these> signs is either not reflectorized or is enclosed-lens retroreflective> sheeting (the weakest kind). The yellow bottom panels are almost> certainly retroreflectorized,­ but not with anything stronger than> encapsulated-lens sheeting; enclosed-lens sheeting is more probable.

The green background was not reflectorized on the older button copy
signs. The yellow AFAIK was.
* Newer signs between 2001-2004: Encapsulated lens sheeting is> probably being used for sign background, legend, and yellow bottom> panels. Compared to enclosed-lens sheeting, encapsulated-lens
sheeting> has a more silvery appearance--white is actually off-white, green is> lighter, etc. Contrast is lower, and differentiation among colors is> not as strong under ordinary lighting.

You are correct on that - the contrast was quite low and it did have a
tint of a 'silver' appearance. Because of the visibility at night and
really in the day against the sun, for example, they were discontinued
in Ohio, WVA, and Kentucky.
* Current signs: Microprismatic (sometimes called
"high-performance")­> sheeting is probably being used for sign background, primary legend,> and yellow bottom panels. The color contrast one gets from> microprismatic sheeting is about the same as from enclosed-lens> sheeting, but the retroreflectivity is MUCH greater--greater than
from> encapsulated-lens sheeting, in fact. Compared to encapsulated-lens> sheeting under ordinary daylight, microprismatic sheeting offers a> darker green, a whiter white, and roughly the same yellow. Most
brands> of microprismatic sheeting I have seen can be recognized by a
stippled> pattern in the reflected light which is immediately evident when the> sign is viewed obliquely under specular light (e.g., unblocked> sunshine).

The yellow is far darker on guide signs. I cannot tell a difference for
regular curve signs. The warning sign the original poster was referring
to are guide signs and not standalone. They include a curve indicator
with "55 MPH" underneath it.
I believe that the W.V. Turnpike 55-M.P.H. curve signs the O.P. asks> about use fluorescent yellow sheeting. That would be a logical
choice> given the safety criticality of those curves (indeed, the majority of> Colorado's new fluorescent yellow warning signs are curve warning> signs). Aside from that, it appears that microprismatic yellow
bottom> panels are being used on overhead guide signs.

Do you have an example of the fluorescent yellow color? When I think of
that, I am thinking of a bright yellow hue, but it is not that bright.

Add comment
Dave Cunningham 15 March 2005 06:33:46 [ permanent link ]
 Thank you all for the help. I believe the post from argatlam is correct as
his views about the specific signs I referred to and the age of these signs
all lines up. Again thanks for the help and its nice to find a place where
this road geek can hang out.


Add comment
Georgia Highways 16 March 2005 01:07:23 [ permanent link ]
 I thought that related just to the brand of sheeting used. There are
several out right now w/ all different shades. I do know that the 3M
VIP diamond grade has been modified a bit colorwise. Definitely the
Avery Prismatic has the lightest tint in color and seems brightest
overall.

Sherman Cahal wrote:> dave cunningham wrote:> > Hi all, new to group. Noticed in the last few years a different
kind> of> > bright yellow on road signs. Best example is on WV turnpike for the> large> > "curve ahead 55mph" signs. Can anyone tell me what this colour is> called or> > where to find the specs for it?>
It is a darker yellow hue. Here are my guidelines for the signs in WV> for guide signs (the large curve ahead signs fall under this):>
Pre-2001: Button copy. Darker green/darker yellow hue.> 2001-2004: Reflectorized. Light green/bright yellow hue.
Unfortunately,> you could see outlines of the posts at night and the signs were> actually too bright at times.> 2004: Darker green/dark yellow hue. Looks beautiful and reflectorizes> very well at night. These are what replaced the majority of the
signage> along the interstates in Charleston and the WV TPK.>
Kentucky also used the lighter green and bright yellow hues around
2001> to 2004, and now use the dark green/dark yellow hue, the same as West> Virginia.

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CarGuru > Driving > New Yellow Color 16 March 2005 01:07:23
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