inter-auto communication device : CallMe Prism

This fantastic idea for an inter-auto communication device. With this device, you can communicate with the guy in front of you and sent messages like “you’re driving too fast”. All license plates could be something like phone numbers to communicate between cars.
Although, since most people have cellular phones now, you could probably just call the car in front of you. How would you know the phone number? Just suction cup the CallMe Prism-I to your rear window.

This device is simply a programmable LCD that is solar powered, and can store about ten numbers. It seems that, the CallMe Prism-I is probably not designed to be an inter-automobile communication system. It is a way for desperate guys or girls to proudly display their digits to anyone passing by.