Katie Couric's Notebook: Texting While Driving

On July 1, California becomes the 27th state, and the biggest, to ban cell phone use by drivers.

It's a good idea. An insurance research group says the risk of a serious crash is four times greater when a driver is on the phone. And drivers aren't just making calls. They're also sending text messages, which can be worse.

To watch my full Notebook, just click on the monitor.