I really don't think we can multi-task at a 100% level. You can dedicate your mind to driving 99%, and texting 1%, but can't do both fully. It likely doesn't take 100% of brain capacity to drive safely (other wise you couldn't have non-driving thoughts or talk to a passenger, etc.), but there's no way to text and drive at a competent level for each. Furthermore, what bothers me about it ([sermon] and this I think is the plague of our culture [/sermon]) is the selfish nature of it. It's people who think that they are so important that they have the right to put the lives of other people at risk to send a 50 character message to a friend about something that really doesn't matter. Smart phones really are destroying our culture- whether it's the dinner table, the art of conversation, or driving, there is a lot of negatives to what otherwise is a very helpful/cool technology.