Demetrius Thompson was struck, twice, by drivers distracted while chatting on their cellphones. Instead of understandably getting mad or sensibly suing the drivers for millions, he instead founded the company Global Mobile Alert which developed a system called MyMobileAlert.

MyMobileAlert tracks the cellphone via GPS as its owner drives about their business. When the system determines the chatty driver is approaching within one hundred feet of a stoplight or a certain distance from an intersection, the cellphone will emit a loud 'chirp' to notify the driver who can then take any appropriate actions.

The only requirement for MyMobileAlert is a GPS-capable cellphone; the issuing wireless company would install the necessary software. So far the system has been demonstrated in  cities such as West Hollywood, California.

[Source: Technology Review]