The Intervention Model is an analytic model designed to measure the effectiveness of the roadside inspections and traffic enforcement (interventions) in terms of crashes avoided, injuries avoided and lives saved.

The Intervention Model is based on the premise that roadside inspections and traffic enforcements directly contribute to the reduction in crashes by discovering defects which are corrected as a result of the intervention. The Intervention Model also concludes that the vehicle/driver violations and crashes are positively correlated and that each violation carries some level of crash risk.