usa-flag-iconAn official website of the United States government Here's how you know
The .gov means it’s official.

Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

This site is secure.

The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Toggle main menu visibility
Skip Navigation Links

Carrier Intervention Effectiveness Model

The Carrier Intervention Effectiveness Model (CIEM) provides FMCSA with a tool for measuring the safety benefits of carrier interventions, measuring the direct impact of interventions on carriers that received them. The CIEM is based on data from the individual and cumulative "before and after" changes in the safety performance of carriers that received interventions in a given year. The model compares motor carriers’ crash rates in the 12 months following an intervention to their crash rates in the 12 months prior to the intervention. This change in crash rates is adjusted for the observed change in crash rates for carriers not receiving interventions.

The CIEM incorporates data collected from compliance reviews (CRs) and other carrier interventions, including warning letters, offsite investigations, onsite focused investigations, and onsite comprehensive investigations. The CIEM yields national-level measurements that estimate the effectiveness of FMCSA’s carrier interventions.

To learn more about the CIEM and the effectiveness of FMCSA carrier interventions, view the CIEM reports found here.

–>View Model Reports
Carrier Intervention Effectiveness Model - National Results
FY 2009FY 20101FY 20111FY 2012FY 2013FY 2014FY 2015FY 20163FY 20173FY 20183
Total Interventions28,33131,36558,19943,27538,14034,93234,69544,35941,74841,240
CSA Warning Letter2,1845,79039,00423,83520,22520,53520,44330,53026,98226,970
Offsite Investigation34568763961861938116912791238
Onsite Focused Investigation5201,1996,24610,4709,3887,3767,9117,1107,4977,573
Onsite Comprehensive Investigation3868291,4007,0395,7965,8915,3955,9816,3875,925
PRISM Warning Letter7,5007,4151,764-------
Compliance Review216,51714,5648,263-------
Non-ratable Review8798818831,3132,112749777611791534
Estimated Benefits
Crashes Prevented2,3981,8306,5675,2837,2565,8117,1367,6488,7659,627
Injuries Prevented1,5081,1424,0333,251R4,3543,3163,9654,2134,8185,153
Lives Saved8059215175R229168212222269275
R Revised per FY 2013 CIEM Summary Report.
1 These results have been updated to reflect refinements to the CIEM, and hence do not necessarily correspond with results published in archived reports.
2 Beginning in FY 2012, all reviews previously considered motor carrier safety compliance reviews are included in the CSA onsite comprehensive investigations total.
3 Beginning with FY 2016, these results reflect a model revision incoporating month-by-month comparison groups.
Go To Top of Page