title: Effect of a postviolation driver improvement class on traffic convictions and crashes.
abstract: OBJECTIVE
  To investigate the effect of a driver improvement class on postclass moving traffic violations and crashes among drivers charged with speeding.
  
  
  METHODS
  A total of 5079 drivers who completed an 8-hour class were compared to a control group of 25,275 drivers from the same locale who had been convicted of speeding during the same time period but had not taken the class. Counts of convictions and crashes were available for all drivers for 2 years prior to the class and between 1 and 3 years after the class or key speeding conviction. Zero-inflated negative binomial models were used to measure the expected number of convictions among those who took the class compared with subjects who did not take it.
  
  
  RESULTS
  Individuals with a moving violation conviction had 2.5 times the odds of having previous convictions for moving violations and almost 1.5 times the odds of having been involved in a crash. Drivers who took the class had convictions similar to the control group after the class (Incidence Rate Ratio [IRR]: 1.03, 95% confidence interval [CI]: 0.95-1.12) but were less likely to be involved in subsequent crashes (IRR: 0.83, 95% CI: 0.77-0.91).
  
  
  CONCLUSIONS
  The results suggest that among drivers overall, exposure to driver improvement classes as a means to change drivers' behaviors is not significantly associated with fewer convictions for moving violations but may be effective in reducing crashes.
authors.affiliation: Department of Epidemiology and Injury Prevention Research Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7505, USA. avillav@unc.edu
authors.forename: Andrés
authors.initials: A
authors.lastname: Villaveces
authors.forename: Herbert G
authors.initials: HG
authors.lastname: Garrison
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Smith
authors.forename: Jennifer P
authors.initials: JP
authors.lastname: King
authors.forename: J Michael
authors.initials: JM
authors.lastname: Bowling
authors.forename: Eric A
authors.initials: EA
authors.lastname: Rodgman
mesh_terms: D000063:Accidents, Traffic / Q000517:prevention & control / Q000706:statistics & numerical data*; D000293:Adolescent; D000328:Adult; D001334:Automobile Driving / Q000193:education* / Q000331:legislation & jurisprudence*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015397:Program Evaluation; D055815:Young Adult