>> i am a very careful driver. >> and she told us using her phone while driving was out of the question. >> you can't talk on your cell phone. obviously you can't text. >> was she able to stick to that rule? her mother's counting on it. >> i'm hoping no texting and driving. that's supposed to be one of our rules. >> carissa's mom was in a serious accident a few years ago when a driver blew through a four-way stop sign. >> the car was smashed up right to where i was sitting. so if my kids would have been with me they would not be here today. >> so this is much more personal having this camera installed in your car. >> yes, it is very serious. >> so how seriously has carissa taken all of her mother's warnings? >> red light, red light, red light -- >> reporter: in the video from inside her car, again and again carissa is nabbed using her phone while she's driving. a distraction that causes her to miss this light changing. she hits the brakes so hard, her purse goes flying. her mother's reaction -- >> you know, just one bad decision, she could kill somebody, kill herself. >> reporter: now it's katy's turn. she also told us she wouldn't use her phone behind the wheel.