Differences in traffic violations and at-fault crashes between license suspension and revocation

▶ We analyze the police profiles of 154,000 drivers in South Korea using covariance and the t-test. ▶ We model differences between drivers whose license was revoked and drivers whose license was suspended. ▶ We find that the suspension group committed traffic violations less often than the revocation group for the following periods. ▶ License suspension might be more effective at increasing compliance to traffic laws than license revocation. Upon conviction for particular traffic offenses, drivers can have their licenses revoked. Drivers who receive license revocation have an opportunity to apply for a sentence reduction, and some of those who apply receive a reduced sanction — license suspension. There may be differences between drivers whose license was revoked as originally sentenced and drivers who received the reduced sanction of license suspension with regard to traffic violations and crashes after driving privileges are restored. This study verified the differences during the follow-up periods of 6, 12, and 18 months using analysis of covariance and the t-test with stratified samples based on the police profiles of approximately 154,000 drivers in South Korea. The study found that drivers in the group whose license had been suspended committed traffic violations and caused traffic crashes less often for all time periods than those whose license had been revoked. However, omitted factors such as the attitude of suspended drivers and exposure to traffic violations and crashes (e.g., driving frequency after license reinstatement), are likely to affect the findings; thus, caution should be exercised when the findings are referenced for policy implications.