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Learning Center

Here you will find everything from technical reports and training materials, to one-on-one guidance to understand and improve your State’s data quality.

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Learning Center > State Safety Data Quality

Methodology for State Safety Data Quality

FMCSA’s Methodology for State Safety Data Quality (SSDQ) evaluates the completeness, timeliness, accuracy, and consistency of the State-reported commercial motor vehicle crash and inspection records in the Motor Carrier Management Information System (MCMIS). The SSDQ evaluation uses a 12-month time period that ends three months prior to the MCMIS snapshot for each measure, unless otherwise stated in the rating description. Eight of the nine SSDQ measures also have a leading indicator, which acts as a forecast for where measures might be trending based on the three most-recent months of data not included in the current rating. Read full description

 

  • Improvements or changes made to the "State Safety Data Quality" methodology are documented below.

    • May 7, 2024
      • FMCSA adjusted the rating thresholds for several SSDQ measures and updated the standard by which it determines crash and inspection records to be reported on-time for the timeliness measures. These changes were previewed for over a year and went into effect as of the March 2024 snapshot. The SSDQ Overview job aid provided detailed information about the changes; however, the information about accessing the preview area is no longer applicable.
        • On-time Crash Timeliness measure reporting reduced from 90 days to 45 days to upload.
        • On-time Inspection Timeliness measure reporting reduced from 21 days to 7 days to upload.
    • December 27, 2019
      • The Fatal Crash Completeness measure now excludes certain FARS records that state analysts identify in the FARS/MCMIS Matching Tool. This responds to a change in FARS data, whereby NHTSA reclassified some pick-up trucks to a large medium/heavy-duty truck category in the 2018 FARS data.
      • The Crash Record Completeness measure now excludes certain records from evaluation in cases where data are legitimately missing and where state analysts have noted this by entering corresponding keywords in the driver last name field.
      • The Crash VIN Accuracy and Inspection VIN Accuracy measures now exclude certain records associated with known glider kits from evaluation.
    • November 30, 2018
      • Records are selected for evaluation using the initial upload date, rather than event date.
      • FMCSA added a leading indicator, which shows where measures could be trending based on the most recent three months of data.
      • The Crash Record Completeness measure now uses the same suspect data check as the Inspection Record Completeness measure.
      • The Crash VIN Accuracy is a new measure, parallel to the Inspection VIN Accuracy measure. As a result, the VIN evaluation is no longer part of the Crash Record Completeness measure.
      • The threshold for an insufficient data rating for the Fatal Crash Completeness measure is now 10 MCMIS records rather than 15. An insufficient data rating can apply to an evaluation percentage of less than 90%.
    • April 7, 2015
      • FMCSA has removed the Non-Fatal Crash Completeness (NFCC) measure from its Data Quality methodology. However, FMCSA will continue to make this information available as an improvement tool to help States evaluate the completeness of reporting non-fatal crash records. Read more about why FMCSA made this change.
    • January 27, 2012
      • The Non-Fatal Crash Completeness measure’s evaluation process was modified by adding additional States and more recent State crash data to the model, adjusting the model based on the amount of rural to urban traffic in each State, and modifying the calculation for determining the measure's rating.
         View the Interactive Guide to learn about the NFCC evaluation process
    • September 24, 2010
      • Two (2) new measures were added to the methodology, which focus on inspection reporting. These measures evaluate the completeness of driver and vehicle inspection data (Inspection Record Completeness Measure), as well as the completeness and accuracy of inspection record vehicle identification numbers (VINs) (Inspection VIN Accuracy Measure).
      • The Crash and Inspection Timeliness measures’ evaluation criteria were modified. The "good", "fair" and "poor" evaluation criteria have each increased by a value of five (5).
      • The Overall State Rating was modified to be based upon five (5) crash measures, four (4) inspection measures and one crash indicator.
      • The Overall State Rating’s evaluation criteria were modified. A state will receive a "good" overall rating if it has at least one "good" crash measure, one "good" inspection measure, and no "poor" measures. Those states that do not meet the "good" measure criteria and do not have any "poor" measures will receive a "fair" rating. The "poor" criteria have not changed.
    • October 30, 2007
      • Two (2) new measures were added to the methodology. These measures evaluate the completeness of driver and vehicle crash data (Crash Record Completeness measure) and the complete reporting of non-fatal crash records (Non-Fatal Crash Completeness measure).
      • A Crash Rating was added to evaluate only crash data quality.
    • June 23, 2006
      • The Crash Accuracy measure’s evaluation process was modified. The crash accuracy analysis now excludes all "Carrier Non-Identifiable" crash records. This modification prevents records that are entered into the Motor Carrier Management Information System using FMCSA's guidelines without carrier identification from being included in the calculation of the measure.
    • March 31, 2006
      • The Crash and Inspection Timeliness measures’ evaluation processes were modified. The timeliness analysis now includes both 'add' and 'change' records. This modification allows all crash and inspection records uploaded to MCMIS within a specific timeframe to be evaluated. The previous methodology only included 'add' records.
    • December 23, 2004
      • The Crash and Inspection Accuracy measures’ evaluation processes were modified. The analysis now includes interstate carriers and intrastate hazardous material carrier records to determine the percentage of records matched to a motor carrier in MCMIS. The previous methodology only included interstate carriers.