Drive down any U.S. interstate and there's a good chance you will see a pun or a funny reference on the next electronic message board you spot ... as dynamic message signs, and they usually ...

The most consistent sign drivers will notice on the electronic boards will indicate the current speed limit. If traffic is flowing without a problem, the signs will show the normal 70 miles an hour.

There’s an electronic message board at 16th and P streets lately that ... It turns out this wasn’t the only changeable message sign hacked in the region recently. Another incident occurred ...