Reducing DUI-related collisions: evaluating the effectiveness of enhanced DUI enforcement

The purpose of this study was to determine whether a correlation existed between a city’s DUI rate and DUI Crash rate. The author’s hypothesis was that an increase in DUI arrest rate would lead to a decrease in DUI-related collisions. Arrest data, crash data and population data were drawn from RAND California for all cities in the State of California for the years of 2000 to 2009. This data were utilized to create variables for the percent change in DUI arrest rate and DUI crash rate from the first half of the decade (2000 to 2004) to the second half of the decade (2005-2009). These percent change variables were correlated using a Pearson’s bi-variate analysis. The results showed a weak positive correlation between the percent change in DUI arrest rates and DUI crash rates. This indicates that as DUI arrests increase, DUI-related crashes increase as well. Due to the limitations of this research model and the resulting weak positive correlation, further research will need to be conducted to determine, with greater certainty, the correlation between enhanced DUI enforcement and DUI-related collisions.