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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.

–>View Model Reports
Roadside Intervention Effectiveness Model - National Results*
CY 2003CY 2004CY 2005FY 2006FY 2007FY 2008FY 2009FY 2010FY 2011FY 2012FY 2013
Total Interventions3,006,7853,013,6403,020,9053,273,0623,369,5173,479,7453,519,6443,560,3333,601,9413,581,9003,492,137
Roadside Inspections2,215,6692,210,8422,193,9542,372,8022,616,8682,723,5762,788,7282,849,3503,021,0023,065,689**3,089,760
Traffic Enforcement791,116802,798826,951900,260752,649756,169730,916710,983580,939516,211**402,377
Crashes Prevented15,42715,82016,78017,01516,87017,51716,93916,48414,77914,521**13,919
Roadside Inspections7,1767,3537,5757,5938,1018,4648,1498,1548,3118,585**9,904
Traffic Enforcement8,2518,4679,2059,4228,7699,0538,7898,3306,4685,936**4,015
Injuries Prevented11,73011,53511,63411,40510,87411,13710,82110,3699,0808,892**8,450
Roadside Inspections5,4565,3625,2525,0905,2225,3815,2065,1295,1065,257**6,012
Traffic Enforcement6,2746,1746,3826,3165,6525,7555,6145,2403,9743,635**2,438
Lives Saved681611624644638629573521484475**448
Roadside Inspections317284282287307304275258272281**319
Traffic Enforcement364327342357332325297263212194**129
*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.
**FY 2012 interventions breakout and safety results were slightly revised per the RIEM FY 2013 Summary Report, incorporating updates to the FMCSA Traffic Enforcement Program’s violations list.
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