Why Were You Stopped


The clues police use to detect and arrest persons suspected of driving while intoxicated is located within the United States Department of Transportation National Highway Traffic Safety Administration Guide regarding the best practices for police.

(1) Problems in maintaining proper lane position
      • Weaving
      • Weaving across lane lines
      • Straddling a Line
      • Swerving
      • Turning with a Wide Radius
      • Drifting
      • Almost Striking a Vehicle or Another Object

(2) Speed and Braking Problems
      • Stopping Problems (too far, too short, too jerky)
      • Accelerating or decelerating for no apparent reason
      • Varying Speed
      • Slow speed (10+ MPH under the limit)

(3) Vigilance Problems
      • Driving in opposing lanes or the wrong way on a one way street
      • Slow response to traffic signals
      • Slow or failure to respond to Police signals
      • Stopping in Lane for no Apparent Reason
      • Driving without headlights at night
      •Failure to signal or signal is inconsistent with action

(4) Judgment Problems
      • Following too closely
      • Improper or unsafe lane change
      • Illegal or unsafe lane change
      • Illegal or improper turn (too fast, jerky, sharp)
      • Driving on other than the designated roadway
      • Stopping inappropriately in response to police
      • Inappropriate or Unusual behavior (throwing, arguing)
      • Appearing to be impaired

(5) Post Stop Cues
      • 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 police or police must repeat
      • Providing incorrect information, changes answers
      • Odor of alcoholic beverages from driver