Why you shouldn't drive slowly in the left lane - Vox:
"... Lanes changes account for about four percent of all car accidents in the US, and perhaps as much as ten percent of accidents on highways. Meanwhile, research has generally shown that the strongest predictor of an accident isn't speeding, but variance from the average speed of traffic — and a car going five miles per hour slower than the surrounding traffic has a greater chance of causing an accident than one going five miles per hour faster than it...."
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