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The Detection of DWI Motorcyclists

Motorcycle DWI Detection Guide

NHTSA has found that the following cues predicted impaired motorcycle operation.

Excellent Cues (50% or greater probability)

  • Drifting during turn or curve
  • Trouble with dismount
  • Trouble with balance at a stop
  • Turning problems (e.g., unsteady, sudden corrections, late braking, improper lean angle)
  • Inattentive to surroundings
  • Inappropriate or unusual behavior (e.g., carrying or dropping object, urinating at roadside, disorderly conduct, etc.)
  • Weaving

Good Cues (30 to 50% probability)

  • Erratic movements while going straight
  • Operating without lights at night
  • Recklessness
  • Following too closely
  • Running stop light or sign
  • Evasion
  • Wrong way