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DUI Cues

The DWI cues related to problems in maintaining proper lane position include,

  • Weaving,
  • Weaving across lane lines,
  • Straddling a lane line,
  • Drifting,
  • Swerving,
  • Almost striking a vehicle or other object, and
  • Turning with a wide radius, or drifting during a curve.

The DWI cues related to speed and braking problems include,

  • Stopping problems (too far, too short, too jerky),
  • Accelerating for no reason,
  • Varying speed, and
  • Slow speed.

The DWI cues related to vigilance problems include,

  • Driving without headlights at night,
  • Failure to signal a turn or lane change, or Signaling inconsistently with actions,
  • Driving in opposing lanes or the wrong way on a one-way street,
  • Slow response to traffic signals,
  • Slow or failure to repsond to officer's signals, and
  • Stopping in the lane for no apparent reason.

The DWI cues related to judgment problems include

  • Following too closely,
  • Improper or unsafe lane change,
  • Illegal or improper turn (too fast, jerky, sharp, etc.),
  • Driving on other than the designated roadway,
  • Stopping inappropriately in response to an officer,
  • Inappropriate or unusual behavior, and
  • Appearing to be impaired.

Post-Stop Cues

In addition to the driving cues, the following post-stop cues have been found to be excellent predictors of DWI.

  • Difficulty with motor vehicle controls,
  • Difficulty exiting the vehicle,
  • Fumbling with driver's license or registration,
  • Repeating questions or comments,
  • Swaying, unsteady, or balance problems,
  • Leaning on the vehicle or other object,
  • Slurred speech,
  • Slow to respond to officer/officer must repeat questions,
  • Provides incorrect information or changes answers, and
  • Odor of alcoholic beverage from the driver.

DWI DETECTION GUIDE

Weaving plus any other cue: p = at least .65

Any two cues: p = at least .50

Problems Maintaining Proper Lane Position

• Weaving, • Weaving across lane lines p=.50–.75

• Straddling a lane line, • Swerving

• Turning with a wide radius, • Drifting

• Almost striking a vehicle or other object

Speed and Braking Problems p=.45–.70

• Stopping problems (too far, too short, or too jerky)

• Accelerating or decelerating for no apparent reason

• Varying speed, • Slow speed (10+ mph under limit)

Vigilance Problems p=.55–.65

• Driving in opposing lanes or wrong way on one-way

• Slow response to traffic signals

• Slow or failure to resond to officer’s signals

• Stopping in lane for no apparent reason

• Driving without headlights at night*

• Failure to signal or signal inconsistent with action*

Judgment Problems p=.35–.90

• Following too closely

• Improper r unsafe lane change

• Illegal or improper turn (too fast, jerky, sharp, etc.)

• Driving on other than the designated roadway

• Stopping inappropriately in response to officer

• Inappropriate or unusual behavior (throwing, arguing, etc.)

• Appearing to be impaired

POST STOP CUES p³ .85

• Difficulty with motor vehicle controls

• Difficulty exiting the vehicle

• Fumbling with driver’s license or registration

• Repeating questions or comments

• Swaying, unsteady, or balance problems

• Leaning on the vehicle or other object

• Slurred speech

• Slow to respond to officer/officer must repeat

• Provides incorrect information, changes answers

• Odor of alcoholic beverage from the driver

• p ³ .50 when combined with any other cue:

• Driving without headlights at night

• Failure to signal or signal inconsistent with action

The probability of detecting DWI by random traffic enforcement stops at night has

been found to be about three percent (.03).

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