But is this a surprise? When New York City first instituted a similar ban, cell-phone use by drivers dropped by 50 percent. But the numbers steadily increased after that, even as the number of citations increased as well. Same thing apparently happened in D.C. -- an initial falloff, but then a return to pre-ban levels of cell usage.
A quick look around the Interwebs shows similar experiences in Connecticut, New Jersey, and elsewhere. Should cities and states drop these laws that aren't being enforced or followed? Or should they, for example, increase fines to make this a more serious offense?