There is also the impact of context switching from phone use to driving, which I imagine pretty much everyone has experienced. The reason for the law is to stop

There is also the impact of context switching from phone use to driving, which I imagine pretty much everyone has experienced. The reason for the law is to stop people being distracted and there is a delay in refocusing attention when switching from phone to driving and even a second or two can make a big difference when you're in charge of a self-propelled chunk of metal.