If you're a parent worried that your teenage driver might be texting while behind the wheel, there's an app for that.

Federal safety regulators are asking automakers to make in-dash devices that allow for texting or web browsing safer.  One company is already doing that with cell phones.

It's called PhoneGuard, and it's designed to prevent texting, web browsing and calling while driving.

It works like this; PhoneGuard uses the cell phone's GPS device to determine if the phone is moving and how fast it's going.

"When the phone is moving faster than ten miles per hour, it recognizes that and a red screen comes up on the phone," says PhoneGuard's Scott Frohman.  "The red screen shuts down features like texting, internet browsing, even calling, as long as the phone is in motion."

If someone calls or texts the phone, they receive an automatic reply which reads, "I cannot answer right now.  I'm driving.  I will contact you when I've reached my destination."

Parents can disable the PhoneGuard app remotely if their child is going to be a passenger in a car, rather than a driver, or if they are taking a bus or a train.

Another feature of the app, one which appeals to adults, is the panic button.

If the car should break down, the person with the cell phone presses the panic button on the app.  That sends the parent, or another registered person, an emergency text, giving the location of the phone, along with a map of where that location is.

A feature that teen's won't like; PhoneGuard can monitor the driving of the driver and inform the parent if that teenager has been speeding, along with a map of where they were going too fast, the time it happened, and the speed they were going.