According to [several studies in the US, Canada and Europe], using a cell phone while driving can be just as dangerous as driving while intoxicated, causing drivers to miss traffic signals and react more slowly to driving conditions. Frighteningly, the NHTSA estimates that more than 100 million U.S. drivers use their cell phone while driving and about 8% of drivers on the roadway at any given daylight moment are either conversing or texting on their cell phone.
  – From RandomHistory.com