The Inspection Vehicle Identification Number (VIN) Accuracy measure evaluates 12 months of data to determine your State's rating. A record is evaluated if the date of the initial upload falls within that 12-month range. As shown below, the range begins 15 months before the evaluation month, but excludes the most recent three months of records. These records were used to calculate the leading indicator, which forecasts where measures may be trending.

In the example, the July 2022 evaluation looks at 12-months of uploads from May 1, 2021, through April 30, 2022. Inspections that were uploaded after April 30, 2022, were used to calculate the leading indicator.

This measure evaluates roadside inspection (Levels 1-6) records representing interstate and intrastate carriers, and includes large trucks and buses. It analyzes the VIN of the first vehicle unit only—all trailing units are excluded. A VIN is invalid if it is less than 17 characters, contains invalid character(s), or does not pass a checksum analysis; for this measure, a VIN that contains the same 17 numbers, such as all 9's, is considered invalid.

The rating percentage is determined by dividing the number of records with valid VINs by the number of total records evaluated. If the percentage of accurate records is:

• 95% or more, the rating is GOOD
• Between 85% and 94%, the rating is FAIR
• Less than 85%, the rating is POOR.