I think you are missing the points I've been trying to make. Cell phone use has skyrocketed, and accident numbers have slightly declined. This being the case, are we to believe that all the other previous causes of car accidents have now disappeared or dramatically declined? From the link I posted previously:
Driver inattention is estimated to be a factor in between 20 to 50 percent of all police-reported crashes. Driver distraction, a sub-category of inattention, has been estimated to be a contributing factor in 8 to 13 percent of all crashes. Of distraction-related accidents, cell phone use may range from 1.5 to 5 percent of contributing factors
If driver inattention is estimated to be a factor in 20-50% of car accidents, and distraction a factor in 8-13% of all crashes, then cell phones cannot be a factor in 28% of car accidents. The numbers don't pan out.
Besides that, isn't the NSC federally funded, and isn't it convenient that the numbers from a federally funded (if they are) entity provides supporting evidence that feds need in order to regulate cell phone use in cars?