If you’re conversing behind the wheel, you’ll drive more safely if your partner is sitting next to you rather than speaking from the other end of a cell phone. That’s because passengers will adjust a conversation in response to traffic conditions and will even break to remind the driver of hazards, according to new research by University of Utah psychologists. “We find that it is actually good for a driver to talk to a passenger, one with driving experience,” said Frank Drews, an associate professor of psychology and lead author of the study.