I thought about asking this question of one of the photographers who posted this image on "Hank's Truck Pictures, but I thought that I'd try it here instead:
http://www.hankstruckpictures.com/pix/trucks/dfaust/2008/06-27/img_0645.jpg
I see a few signs after the merge sign there. What are they?
From what little I can see in the image, they look like the truck rollover warning sign. The other clue to me is the sharpness of the turn ahead.
The second warning sign looks like a curve-ahead warning sign with an advisory speed limit. The first warning sign is too fuzzy for me.
I'd venture it's a truck roll-over advisory/warning sign, given by the freeway's curves and the curve-ahead warning sign.
Do you know where this shot is?
odd thing is, the truck (or whatever that big blob is) looks to be perfectly level. On a rollover warning sign, the truck is at quite the exaggerated angle of failure.
email David Faust and seeing if he has the higher-resolution original.
That slope is tall enough and steep enough to generate some significant katabatic winds--I suspect the off-in-the-distance sign warns truckers specifically of gusts.
It has two pink flags on the sign, which usually indicates it's either a temporary or a new condition. It can also be used in case of a sudden warning of something that hasn't been experienced to that point. I do see the large blockish truck outline, but if anything, it's tilted to the right. I've never seen a graphical wind gust sign that looks remotely like that, so I doubt it's that, but I'd also agree it doesn't seem like trucks tipping. Could it be for rocks falling? If it were another country, I'd suggest a tunnel sign.
From other pictures I've seen, that looks a lot like it could be EB I-70 west of Denver, coming down out of the Rockies.
A little digging on the website shows this to be the Rye Valley, OR exit (Exit 340) on I-84, and specifically looking westbound.
GMSV isn't very helpful, but the first sign does appear to be ODOT's version of W1-13 (http://www.trafficsign.us/650/warn/w1-13.gif) (the truck rollover sign). Can't tell what the advisory sign says.
Second sign is definitely a curve sign, with a 55 MPH advisory speed.
The rectangular orange sign before the merge advisory? That'd be ODOT's "End Road Work" sign.
One appears to be just a truck advisory sign. The following image looks at the sign posted along eastbound Interstate 84 after Exit 330:
(//www.aaroads.com/forum_images/west/i-084_eb_exit_335_01.jpg) (//www.aaroads.com/forum_images/west/i-084_eb_exit_335_01.jpg)
The rectangular sign is a speed-advisory sign. Several of these are posted along that stretch of Interstate 84, including this eastbound assembly after Exit 335.
(//www.aaroads.com/forum_images/west/i-084_eb_exit_338_01.jpg) (//www.aaroads.com/forum_images/west/i-084_eb_exit_338_01.jpg)