shmG writes to share news of a recent study on the impact of laws which ban the use of cell phones while driving. There appears to be no reduction in accidents as a result of these laws. "The HLDI compared collisions of 100 insured vehicles per year in New York, Washington DC, Connecticut, and California — all states with currently enacted roadway text bans. Despite those laws, monthly fluctuations in crash rates didn't change after bans were enacted, [although] there were less people using devices while driving. An earlier study conducted by the HLDI reported that cellphone use was directly linked to four-fold increases in crash injuries. Also independent studies done by universities have shown correlation between driving while using a phone and crashes."