The Inspection Selection System (ISS) score is a numerical value ranging from 0 to 100, utilized by roadside inspectors to determine whether a motor carrier’s vehicle warrants inspection.
In this article
- Who receives an ISS Score?
- How are ISS Scores calculated?
- What are the possible ISS Scores?
Who receives an ISS Score?
All Motor carriers receive an ISS score when sufficient safety performance data is available. The score is generated using safety data maintained within the FMCSA’s Safety Measurement System (SMS), which includes records of crash history, roadside inspection outcomes, and violations. In cases where limited data exists - such as new motor carriers - the ISS Inspection Value is determined using an “Insufficient Data Algorithm,” which calculates inspection recommendations based on carrier size and the number of prior inspections.
How is an ISS Score calculated?
The ISS Score is derived from a motor carrier's safety performance data and incorporates the carrier’s BASIC scores alongside violations identified during DOT audits. The ISS calculation places greater emphasis on BASICs that are most effectively addressed through roadside inspections, prioritizing factors such as Hours of Service, Crash Indicator, and Unsafe Driving over other categories. This weighting reflects the significance of these BASICs in assessing overall carrier risk.
What are the possible ISS Scores?
Once an ISS score is calculated for a motor carrier, inspection officers use the following guidelines to determine inspection priority:
- Inspect: Scores of 75 - 100 indicates that an inspection is warranted and is given top priority by officers.
- Optional: Scores of 50 - 74 indicates that an inspection may be conducted at the officer’s discretion.
- Pass: Scores of 1 - 49 indicate that an inspection is generally not warranted.
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