I use them on projects. The electronic message board can be set up on the side of the shoulder and important messages programmed to alert drivers of upcoming traffic problems.
There are rules of how many lines and panels. That, and there is a list of approved abbreviations to help with the limited space for words. All, in all, they usually help, although I sometimes think they're more lawyer repellents, than public information.
I've never place anything objectionable on a board, although one message came to mind yesterday. Traffic was the usual fubared congregation of pinheads, and aggressive drivers that ignored the message board that warned them of a closed lane ahead.
The board was at least a mile from the lane closure, and warned of the right lane being closed. To a good driver, this means to immediately start making an effort to get in the left lane. To the dumbass, this means driving all the way to the barrels, and try to squeeze in. After all, their time is much more important than the time of everyone else.
My objectionable message?
First panel: "RIGHT LANE CLOSED AHEAD"
Second panel: "DUMBASSES MUST MERGE LEFT TOO"
That message would have led to many complaints, although a simple response from an official, such as: "I don't know why you're so upset, unless you're a dumbass." would have ended the conversation.
Anyway, some important things could be placed on the message boards. Unfortunately, people are so anal these days, somebody would have some health problem after reading their behavior described, and run off into the ditch.
In Case You've Wondered
My blog is where my wandering thoughts are interspersed with stuff I made up. So, if while reading you find yourself confused about the context, don't feel alone. I get confused, too.
If you're here for the stories, I started another blog: scratchingforchange.blogspot.com
One other thing: sometimes I write words you refuse to use in front of children, or polite company, unless you have a flat tire, or hit your thumb with a hammer.
I don't use them to offend; I use them to embellish.