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Source: Study: Talking on a Phone Worse than Driving Drunk

Direct Line reported that the results showed drivers' reaction times were, on average, 30 percent slower when talking on a handheld mobile phone than when legally drunk - and nearly 50 percent slower than under normal driving conditions.

Also, the tests showed, drivers talking on phones were less able than drunk drivers to maintain a constant speed, and they had greater difficulty keeping a safe distance from the car in front.