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Roadside Intervention Effectiveness Model

The Roadside Intervention Effectiveness Model (RIEM) is based on the premise that interventions, such as roadside inspections and traffic enforcements, correct vehicle and driver violations thereby preventing crashes and injuries, and saving lives.

The RIEM relies on roadside inspection and traffic enforcement data collected by Safety Investigators. The Roadside Inspection Program evaluates roadside inspections, while the Traffic Enforcement Program evaluates traffic stops triggered by a moving violation. The RIEM associates each violation of the Federal Motor Carrier Safety Regulations (FMCSR) with a crash probability. Using these probabilities, analysts can estimate the number of crashes prevented as a result of correcting these violations.

To learn more about the RIEM and the effectiveness of roadside interventions and the Traffic Enforcement Program, view the RIEM reports found here.
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Roadside Intervention Effectiveness Model - National Results
Intervention SummaryCY 2003CY 2004CY 2005FY 2006FY 2007FY 2008FY 2009FY 2010FY 2011FY 2012
Total Interventions3,006,7853,013,6403,020,9053,273,0623,369,5173,479,7453,519,6443,560,3333,601,9413,581,900
Roadside Inspections2,215,6692,210,8422,193,9542,372,8022,616,8682,723,5762,788,7282,849,3503,021,0023,071,817
Traffic Enforcement791,116802,798826,951900,260752,649756,169730,916710,983580,939510,083
Crashes Prevented15,42715,82016,78017,01516,87017,51716,93916,48414,77914,424
Roadside Inspections7,1767,3537,5757,5938,1018,4648,1498,1548,3118,721
Traffic Enforcement8,2518,4679,2059,4228,7699,0538,7898,3306,4685,703
Injuries Prevented11,73011,53511,63411,40510,87411,13710,82110,3699,0808,833
Roadside Inspections5,4565,3625,2525,0905,2225,3815,2065,1295,1065,341
Traffic Enforcement6,2746,1746,3826,3165,6525,7555,6145,2403,9743,492
Lives Saved681611624644638629573521484472
Roadside Inspections317284282287307304275258272285
Traffic Enforcement364327342357332325297263212187
*These results have been updated to reflect refinements to the Intervention Model, and hence do not necessarily correspond with results published in archived reports. A description of the model refinements can be found in Appendix A of the report FMCSA Safety Program Effectiveness Measurement: Intervention Model Fiscal Year 2009.
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