Some of the most dangerous motorist on the roads these days are cell phone users. They are especially dangerous to cyclist.
So I propose this. Almost all new cell phones have a GPS chip. I suggest they be programed to shut down the cell phone if the phone is moving faster than 10 mph. Some may think that is extreme, but think of the lives and crashes it would prevent. If it your call is that important, pull over, make the call and then continue on your way!!!