Section 14.11 National Highway Traffic Safety Administration Impairment Clue Chart

• Library: DWI 2014 FORMS

NHTSA IMPAIRMENT CLUE CHART

IMPAIRMENT CLUE	OBSERVED BY OFFICER	NOT OBSERVED BY OFFICER	SOURCE NHTSA 2000 [NHTSA 1995] {NHTSA 2002}
INITIAL OBSERVATIONS
Slowed reactions			V-2, [V‑2], {V‑2}
Willingness to take risks			V‑2, [V‑2], {V‑2}
Impaired vision			V‑2, [V‑2], {V‑2}
Poor coordination			V‑2, [V‑2], {V‑2}
VISUAL CUES OF DRIVING
Turning with wide radius			V‑4, [V‑5 65%], {V‑5}
Straddling center or lane marker			V‑4, [V‑5 65%], {V‑5}
Appearing to be impaired			V‑4, [V‑5 60%], {V‑5}
Eye fixation			V‑4, [V‑5], {V‑5}
Tightly gripping steering wheel			V‑4, [V‑5], {V‑5}
Slouching in seat			V‑4, [V‑5], {V‑5}
Gesturing erratically or obscenely			V‑4, [V‑5], {V‑5}
Face close to the windshield			V‑4, [V‑5], {V‑5}
Drinking in vehicle			V‑4, [V‑5], {V‑5}
Driver’s head protruding from vehicle			V‑4, [V‑5], {V‑5}
Almost striking object or vehicle			V‑4, [V‑5 60%], {V‑5}
Weaving			V‑4, [V‑5 60%], {V‑5}
Driving on other than designated roadway			V‑4, [V‑5 55%], {V‑5}
Swerving			V‑5, [V‑6 55%], {V‑6}
Speed slower than 10 MPH			V‑5, [V‑6 50%], {V‑6}
Stopping in lane for no apparent reason			V‑5, [V‑6 50%], {V‑6}
Following too closely			V‑5, [V‑6 50%], {V‑6}
Drifting			V‑5, [V‑6 50%], {V‑6}
Tires on center lane marker			V‑5, [V‑6 45%], {V‑6}
Braking erratically			V‑5, [V‑6 45%], {V‑6}
Drifting into opposing or oncoming traffic			V‑6, [V‑7 45%], {V‑7}
Slow response to traffic signals			V‑6, [V‑7 40%], {V‑7}
Signaling in- consistent with driving actions			V‑6, [V‑7 40%], {V‑7}
Stopping inappropriately (other than in traffic lane)			V‑6, [V‑7 35%], {V‑7}
Turning abruptly or illegally			V‑6, [V‑7 35%], {V‑7}
Accelerating or decelerating rapidly			V‑6, [V‑7 30%], {V‑7}
Headlights off			V‑6, [V‑7 30%], {V‑7}
STOPPING SEQUENCE
Attempt to flee			V‑9, [V‑10], {V‑10}
No response			V‑9, [V‑10], {V‑10}
Slow response			V‑9...