The ones Massachusetts purchased rarely have all character positions operable (even when new!). The number of available characters is so low, that most messages require multiple screens. The time between screens has been set to 5 seconds or so, resulting in only being able to read half the message before passing the sign. They seem to have popped up everywhere, they all have defects and some company is congratulating themselves for having carted off a shedload of cash while unloading a bunch of obsolete and defective merchandise at full list price.
Thankfully, the signs very rarely display useful information, more often the message is something along the lines of:
SLOW DOWN OR MOVE OVER FOR STOPPED EMERG VEHICLES ITS THE LAW
(^^^ you see a random third of this message)
USE YAH BLINKAH!
DRIVE DRUNK GO TO JAIL
Why can't they just leave the damn things off, unless they have something important to say? Seriously, if they're always displaying unimportant messages (no, not driving drunk is very important, but by now, we should all know that) don't people tend to ignore them after a while?