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Recognizing Impaired Driving: Key Cues and Detection

Learn to identify and describe cues of impaired driving in Phase One with this comprehensive guide. Understand common symptoms of alcohol influence, visual cues of driving while intoxicated, and post-stop clues. Enhance your observation skills to recognize issues with lane position, speed, braking, vigilance, and judgment. Explore visual cues for detecting impaired motorcycle drivers and practice recognizing evidence of alcohol/drug influence. Test your knowledge with interactive questions.

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Recognizing Impaired Driving: Key Cues and Detection

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  1. Session 5 1 Hour 30 Minutes Phase One: Vehicle in Motion

  2. Learning Objectives • Identify typical cues of Detection Phase One • Describe the observed cues clearly and convincingly

  3. Phase One: Vehicle in Motion Initial Observation of the Vehicle in Operation ?

  4. Phase One: Vehicle in Motion Initial Observation of the Vehicle in Operation ? Should I Stop the Vehicle? Observation of the Stop

  5. Phase One: Vehicle in Motion (Cont.) Initial Observation of the Vehicle in Operation ? Should I Stop the Vehicle? Observation of the Stop

  6. 0.03 0.08 0.05 0.10 Slowed Reaction Impaired Vision Impaired Judgment Poor Coordination Common Symptoms of Alcohol Influence Blood Alcohol Concentration

  7. 0.03 0.08 0.05 0.10 Slowed Reaction Impaired Vision Impaired Judgment Poor Coordination Common Symptoms of Alcohol Influence (Cont.) Blood Alcohol Concentration

  8. Visual Detection of Driving While Intoxicated

  9. Most Common and Reliable Initial Indicators of DWI • Problems in maintaining proper lane position • Speed and braking problems • Vigilance problems • Judgment problems

  10. Problems Maintaining Proper Lane Position • Weaving • Weaving across lane line • Drifting • Straddling a lane line • Swerving • Almost striking object or vehicle • Turning with a wide radius

  11. Speed and Braking Problems • Stopping problems • Unnecessary acceleration or deceleration • Varying speed • 10 mph or more under the speed limit

  12. Vigilance Problems • Driving without headlights at night • Failure to signal or signal inconsistent with action • Driving in opposing lanes or wrong way on one way • Slow response to traffic signals • Slow or failure to respond to officer’s signals • Stopping in lane for no apparent reason

  13. Judgment Problems • Following too closely • Improper or unsafe lane change • Illegal or improper turn • Driving on other than designated roadway • Stopping inappropriately in response to officer • Inappropriate or unusual behavior • Appearing to be impaired

  14. Post Stop Clues • Difficulty with motor vehicle controls • Fumbling with driver license or registration • Difficulty exiting the vehicle • 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

  15. Visual Cues of Motorcycle Impaired Drivers

  16. Motorcycle DUI Detection GuideExcellent Cues (50% or Greater Probability) • Drifting during turn or curve • Trouble with dismount • Trouble with balance at a stop • Turning problems • Inattentive to surroundings • Inappropriate or unusual behavior • Weaving

  17. Motorcycle DUI Detection GuideGood 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 • Traveling wrong way

  18. Elements of the Driving Task

  19. Safe Driving Demands • Safe driving demands the ability to divide attention among numerous simultaneous tasks.

  20. Vehicle In Motion Initial Cues • What do you see? • Moving violation? • Equipment violation? • Other violation? • Unusual operation? • Anything else?

  21. Phase One: Task One Initial Observation of Vehicle Operation • Requires the ability to: • Recognize evidence of alcohol and/or other drug influence • Describe that evidence clearly and convincingly

  22. Procedures for Practicing Cue Recognition and Description • View DWI violation videos • Take notes • Testify • Choose words carefully • Provide as much detail as possible • Construct accurate image of observations • Critique testimony

  23. Leaving the Shopping Center

  24. The Charcoal SUV

  25. Vehicle in Motion Stopping Sequence • What do you see? • Tries to flee? • No response? • Slow response? • Abrupt weave? • Sudden stop? • Strikes curb? • New violations? • Anything else?

  26. Phase One: Task Two Observation of the Stop • Requires the ability to: • Recognize evidence of alcohol and/or other drug influence • Describe that evidence clearly and convincingly

  27. The Sliding Sports Car

  28. The Impatient Driver

  29. Half in the Bag

  30. QUESTIONS?

  31. Test Your Knowledge • The Phase One tasks are ___________ • Two common symptoms of impairment are: • A. _______________________________ • B. _______________________________

  32. Test Your Knowledge (Cont.) • Alcohol impairs the ability to _____ among tasks • Three cues reinforcing the suspicion of DWI which may be observed during the stopping sequence are: • A. _____________________________ • B. _____________________________ • C. _____________________________

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