CU Boulder:

In a recent study, a researcher at the University of Colorado Boulder found no evidence that a California ban on using hand-held cellphones while driving decreased the number of traffic accidents in the state in the first six months following the ban.
 The findings, published in the journal Transportation Research Part A: Policy and Practice, are surprising given prior research that suggests driving while using a cellphone is risky. For example, past laboratory studies have shown that people who talk on a cellphone while using driving simulators are as impaired as people who are intoxicated.
 “If it’s really that dangerous, and if even just a fraction of people stop using their phones, we would expect to find some decrease in accidents,” said Daniel Kaffine, an associate professor of economics at CU-Boulder and an author of the study. “But we didn’t find any statistical evidence of a reduction.”

Via Stefan Constantine.