We also need to consider what happens when those laws are passed. In my state, it's illegal to use your phone while driving. Calls are permitted with a headset only. So do people stop using their phones? Not at all. They just keep their phone out of sight to try to avoid a ticket, which is even worse. Now, rather than bringing the phone up where one can see the phone and the road at the same time, people are looking down in their laps, taking their eyes off the road.
People will, for the most part, do what they want to do. Changing behavior is very difficult and laws are often quite ineffective at affecting the change desired. I'm not saying we should just accept that people will always use phones or that it's OK to do so, but a lot of times the "solutions" are worse than the problems they intend to solve. Also I'd love to see safety data regarding cell phones in regions that have strict laws vs. those that don't. Everything I've outlined has just been from personal observations and anecdotes.
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