From: The Observed Effects of Teenage Passengers on the Risky Driving Behavior of Teenage Drivers," published on line in Accident Analysis and Prevention.
Note: the difference for exceeding the speed limit by gender (posted in the middle comparison) is not statistically significant.
"With a male passenger present, one-fourth of teenage drivers exceeded the speed limit by at least 15 mph (versus less than 10 percent of general traffic)."
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