Alcohol/Drug Detection Guide

Informed - Jan 28 2008

Driver Observations

Chances in 100 of nighttime driver with BAC equal to or greater than 0.10%

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Driver Error	%
Turning with wide radius	65
Straddling center or lane marker	65
Appearing to be drunk	60
Almost striking object or vehicle	60
Weaving	60
Driving on other than designated road	55
Swerving	55
Slow speed (Over 10 m.p.h. below posted speed)	50
Following to closely	50
Drifting	50
Tires on center or lane marker	45
Breaking erratically	45
Driving into opposing / crossing traffic	45
Signaling inconsistent with actions	40
Slow response to traffic signals	40
Stopping inappropriately	35
Turning abruptly or illegally	35
Accelerating or decelerating rapidly	30
Headlights off	30

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