“All Content Applies to Nighttime Only”, “Visual Detection of Driving While Intoxicated”, “National Highway Traffic Safety”, eastman color, red fade, film was made as a visual aid for a DoT report on drunk driving

“A Drunk Driver Detection Guide was developed and tested at a sample of 10 law enforcement agencies at

locations throughout the United States. The test was designed to provide both longitudinal and cross-sectional

analyses of several measures likely to reflect the impact and utility of using the Guide, and to verify the values

contained in the Guide.

Use of the Guide was accompanied by a statistically significant overall increase in DWI arrest rate of 12

percent. Rates during a three-month period, in which the Guide was used, were compared to a 12-month baseline

period. Five individual agencies had significant increases of up to 94 percent; four agencies had no change; and

one agency had a significant decrease.

The DWI probability values contained in the Guide were verified by the field-test results. Average values

obtained during the field test were essentially the same as average values on the Guide, and Guide values for

individual cues correlated significantly with corresponding values calculated from field-test data.

Experienced police officers who used the Guide expressed doubts about its value in improving their own DWI

enforcement ability. However, they considered the Guide to be valuable for increasing patrol sensitivity to

important cues, training new patrol officers, preparing DWI arrest reports, and supporting court testimony. “