The Inspection Selection System (ISS-D)

The Inspection Selection System (ISS-D) is a decision-aid for commercial vehicle roadside driver/vehicle safety inspections, which guides safety inspectors in selecting vehicles for inspection.

ISS Inspection Value: The ISS Inspection Value is based on the motor carrier's safety performance data. In the case when there is sufficient motor carrier safety performance data available, the value is assigned from information derived from SafeStat results, which reviews safety performance in areas of crash history, inspection history, driver history, and safety management experience. When a motor carrier has little information on file, the ISS Inspection Value is based on an 'Insufficient Data Algorithm', which determines the inspection value by weighting the carrier size and the number of past inspections. Refer to the Inspection Selection System description, for an explanation of the value's calculation.

ISS Recommendation: The ISS Inspection Value forms the basis for the ISS recommendation. The recommendation ranges from 'Inspect', for motor carriers with poor safety performance in one or more Safety Evaluation Areas (SEAs) and for carriers with little or no safety data, to 'Pass' for carriers with good safety performance data. The three recommendations listed are below.


Recommendation ISS Inspection Value
Inspect (inspection warranted) 75-100
Optional (may be worth a look) 50-74
Pass (no inspection required) 1-49

Basis for Recommendation: The Basis for Recommendation describes the method that was used to calculate the ISS Inspection Value. There are two methods for calculating an ISS inspection value:

  • The "Safety" method assigns this recommendation based on SafeStat results, which applies to carriers with sufficient safety performance data.
  • The "Insufficient Data" method is based on an 'Insufficient Data Algorithm', which applies to carriers that have little or no safety performance data available.

Click here to access the Inspection Selection System description, a system designed to prioritize carriers for roadside inspection. This link defines "How ISS-D works".