Preventing Texting while Driving

There should be a sensor in the driver's seat (which senses the weight of a driver - much like the current sensors which alert a driver that the seat belt is not buckled) that sends a signal upward which would disable any cell phone in a 2 to 3 foot radius of the driver.  Such a signal could be tied to a sensor in the engine such that disabling a phone only occurs while the vehicle is moving.  Why has it taken so long for the auto and cellular industries to develop the right solution to prevent drivers from being distracted?  The time is now.
art h 03/01/2014
I saw a guy the other day doing a crossword puzzle while driving. How would you propose to stop that.