Blocked calls.

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Teen drivers may want to stay connected to friends even when behind the wheel, but chatting on a cell phone while driving can be a dangerous distraction. Enter the Key2SafeDriving (K2SD)--a device that parents can slip over a car key. When the key is inserted into the ignition, the K2SD sends a signal that disables a driver's cell phone, except for in emergencies.

Drivers talking or texting on phones are four times more likely to be involved in a crash. "With our device, hopefully kids will become safer drivers," says Xuesong Zhou, an engineer at the University of Utah and one of the K2SD's inventors. "Then their parents will allow them to drive more so they can become experienced drivers."

CELL PHONE USE WHILE DRIVING (2007)

Chatting on a ceil phone while driving is a dangerous distraction. According to the graph, which group of drivers uses their cell phones the most while on the road?

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