No Texting While Driving App???

Hey guys
There are a few apps for Blackberry and Android that disable texting once the car is going over 7mph. I can't find one that operates like that for the iphone. I have found TRUE SMS-Lifesaver app but that one still just allows you to send a message while driving as opposed to disabling the feature while in motion.

I don't know of one. Brilliant idea though.

I have this very complicated, scientific approach. I don't answer my phone when driving. If I'm on a long road trip, I silence it. I'll check my messages when I stop for gas or get to my destination.

Why is it so hard for people to focus on driving and put away the distractions?

I wonder that myself. I *like* being unavailable sometimes, thank you!