The following list is based upon research conducted by the National Highway Traffic Administration, which are symptoms that the police search for when hunting for DWI drivers:
- Turning With a Wide Radius
- Almost Striking Object or Vehicle
- Weaving
- Driving on Other Than Designated Highway
- Swerving
- Stopping Without Cause in Traffic Lane
- Following Too Closely
- Drifting
- Braking Erratically
- Signaling Inconsistent with Driving Actions
- Slow Response to Traffic Signals
- Turning Abruptly or Illegally
- Accelerating or Decelerating Rapidly
- Headlights Off