I have some serious doubts about this... first the technology: how exactly does it accurately spot a text message? What if the guy in the car just a few feet next to you is texting? Can it differentiate between incoming and outgoing texts? If you use some IP-based chat like WhatsApp or Skype, then it can't detect that. Coming Soon: When a Cop Points His Radar Gun at You, It Could Detect More Than Just Speeding | TheBlaze.com
Around here on the highways, we have official green signs that say, "Can't wait?, use our text stop, 1 mile ahead" One mile ahead is an official rest stop to engage in safe texting. I'm just waiting for the graffiti artists to have a field day with that official road sign.
I used to live near "Canal Avenue", the county had to send someone to remove the paint covering the "C" nearly every week. Probably would just be easier to re-name the road.