First, the database used in
this study contained information only on the drivers who were instructed to attend DIP.
Future data collection efforts could focus on gathering similar type of information for a
random sample of drivers (with and without DIP training), which can serve as the “control”
group for evaluating DIP’s effectiveness. This will facilitate a treatment-control evaluation
study. Second, the period of suspension after DIP and the starting date of license suspension
were not fully provided, which could affect the program’s evaluation results. Future research
may also consider conducting this evaluation by type of conviction (speeding, careless
driving or other). Finally, the study methodology presented in this study could be applied for
the evaluation of other driver education programs such as Iowa’s Graduated Driver License
Program or other