The purpose of this study was to find out whether a brief license suspension would be as effective as a more expensive personal interview previously found to reduce accidents and violations among novice drivers. Thirteen thousand four hundred drivers were randomly divided between the two treatments. License suspension was found to be more effective than the interview in reducing accidents and convictions. Among females, those threatened with suspension had better records than those threatened with an interview. Among males, those who actually were suspended had better records than those who attended the interview. The fact that license suspension is significantly less costly than interviews results in a substantial saving in the cost of operating the driver improvement program.