The Visual Detection of DUI Motorists

Explanations of the 24 driving cues

Problems in Maintaining Proper Lane Position
Speed and Braking Problems
Vigilance Problems
Judgment Problems

1) Problems in Maintaining Proper Lane Position

Weaving
Drifting
Swerving
Turning with a Wide Radius

Weaving
Maintaining proper lane position can be a difficult task for an impaired driver. For example, we have all seen vehicles weaving before. Weaving is when the vehicle alternately moves toward [...]

Speed and Braking Problems

The research showed that braking properly can be a difficult task for an impaired driver. For example, there is a good chance the driver is DWI if you observe any type of stopping problem. Stopping problems include,

Stopping too far from a curb or at an inappropriate angle,
Stopping too short or beyond a limit line, and
Jerky [...]