Yes I'm quoting myself lol. But since seeing the photo of the initial (but now ruled-out) truck, there is nothing in the road there.
So maybe I am seeing Mickey's shadow in this pic. But my question still stands about the road sign. The shadow of the road sign can't fall on the truck based on the angle / location of Mickey's shadow in the prior pic. So what is that mark on the passenger's front door?
I think the road is buckling there and a large asphalt patch has been put in. I went to Google Earth and the right side of the patch lines up with a seam in the concrete. The sign on the roadside is a good clue. Probably a warning to slow down. That may explain the odd angle of the truck and why the brake lights are engaged.
Also, I can see it in the original truck photo as well. The "crash photos" had their contrast altered which made the patch look darker in the photo of Mickey in front of Circle K.