A “clean inspection” is when a relevant roadside inspection did not result in any violations for a particular Behavior Analysis and Safety Improvement Category (BASIC). Safety inspections with no violations can improve a carrier’s Safety Measurement System (SMS) results. For example, when a carrier has no BASIC violations related to the Hours-of-Service Compliance, Driver Fitness, and/or Controlled Substances/Alcohol BASICs from a driver inspection, this clean inspection will lower the associated BASIC measure. Similarly, when a carrier does not have any BASIC violations related to the Vehicle Maintenance and/or Hazardous Materials Compliance BASICs from a vehicle inspection, this clean inspection will lower the associated BASIC measure.