Look,  I  just  learned  how  to  Text . . . .

Eyes  on  the  road   and   hands  on the  wheel ! texting  while  driving‏

No text is worth a death

If you don't feel comfortable telling a driver to quit texting outright,
try  hinting:
" Would you like me to type for you since you're driving? " 
or
Start out by simply asking,
“ Would you mind putting the phone down? ”