Motorists who talk on cell phones <A HREF="http://abcnews.go.com/US/wireStory?id=463588">are more impaired than drunken drivers</A> with blood-alcohol levels exceeding 0.08, according to research conducted in 2003. And it doesn't matter whether the phone is hand-held or hands-free. Any activity requiring a driver to "actively be part of a conversation" likely will impair driving abilities.