A DWI prevention program for driving schools consisting of a videotape, slides, a textbook, and a manual was developed and evaluated. Effects of the program on knowledge, attitude, behavior intention, and self-reported DWI behavior were measured by means of a pretest, posttest, one-year follow-up evaluation design. Two-hundred and eight driving school students followed the program and participated in all three measurements. A control group of 228 pupils followed a traditional curriculum without the DWI program and also participated in all three measurements. Principal findings were that knowledge improved, attitudes and behavior intentions were already positive at pretest, DWI was equally reported by both groups, and there was a positive effect on riding with an intoxicated driver.