It's illegal in my state (Oregon) to use cell phones while driving now, but that doesn't stop a lot of people. Despite hefty fines ($142 for passenger vehicles - http://www.drivinglaws.org/oregon.php - and $2750 - $11,000 for commercial vehicles - http://www.oregon.gov/ODOT/MCT/SAFETY.shtml
, people continue. I had another driver cut me and several other people off and driving horribly in general in the space of a few blocks. He happened to park near me and so I remarked, politely (as he was bigger and meaner looking then myself...) - "might want to get off the phone and drive, that's a pretty hefty ticket ($147 for passenger vehicles, $2750 - $11,000 for commercial drivers) (http://www.oregon.gov/ODOT/MCT/SAFETY.shtml) and you're endangering the people around you" - his reply? "Oh I've already gotten 3 tickets I don't care"
The question is, how are we going to deal with this type of mobile user? disable the screen when the accelerometer hits 15mph?