Stick Figure Warning Sign Gallery

This one doesn't exist in reality, as far as I know. This is a quick sketch of a warning sign that I saw in a dream, posted on a side wall of a freeway lane that was under construction. I got sort of lost trying to find a way to get a clear picture of it in the dream.

I'm not sure what the sign is supposed to mean. That's a support cable on the right, and apparently if it breaks, a truck will fall on you.