Folding "WATCH FOR ICE" signs

[hm insulators]

I think Angeles Crest Highway (California 2 through the San Gabriel Mountains near Los Angeles) has them.

[agentsteel53]

there are several folding ICY signs on CA-36 coming down the hill from Susanville.  they fold in half vertically, so when they are not in use one sees a bare aluminum triangle.

also on that road are some curve advisory signs, California-style with the advisory number inside the diamond - and this number can be flipped to something lower in inclement weather.

[lepidopteran]

New Jersey used to have signs reading "Bridge May Be Slippery".  Don't think they folded in half, though.  I suspect there may be some signs still up somewhere.

[US71]

Arkansas was also fond of using Watch For ICE signs before descending a steep hill, such as US 71 at Mt Gaylor or along the Pig Trail (Ar 23).

[_Simon]

I just took a trip to New Orleans (mostly I-81, I-24, I-59, I-10) and have witnessed the following phrases (in the order I encountered them):

"Bridge freezes before road surface"
"Bridge may be icy"
"Bridge ices before road"
"Bridge ices before road in winter" (in TN)
"Bridge ices before road during snow" (in AL)

Also, I found this on google -- never seen it before:  http://www.flickr.com/photos/33098767@N00/3913407136/

[deathtopumpkins]

Also, I found this on google -- never seen it before:  http://www.flickr.com/photos/33098767@N00/3913407136/

Looks like the standard Quebec (Canadian?) one.