- FMCSA
- The Federal Motor Carrier Safety Administration — the US agency that regulates commercial motor vehicles, sets hours-of-service limits, and conducts carrier safety audits.
- Hours of Service (HOS)
- FMCSA rules that limit how many hours a commercial driver may drive and work in a day and a week before a mandatory rest period.
- ELD (Electronic Logging Device)
- A GPS-connected device installed in a commercial truck that automatically records a driver's driving time to verify hours-of-service compliance.
- DVIR (Driver Vehicle Inspection Report)
- A written record completed by the driver before and after each trip documenting the vehicle's condition and any defects found.
- CDL (Commercial Driver's License)
- A state-issued license required to operate a commercial motor vehicle above 26,001 lbs gross vehicle weight rating, or any vehicle carrying hazardous materials.
- DOT Number
- A unique identifier issued by the FMCSA to commercial carriers operating in interstate commerce, used to track safety records and compliance data.
- Pre-Trip Inspection
- A systematic check of brakes, tires, lights, fluid levels, cargo securement, and safety equipment that drivers must complete before every trip under FMCSA regulations.
- Cargo Securement
- The methods and equipment — straps, chains, blocking, and bracing — used to prevent cargo from shifting or falling from a vehicle during transport.
- Reasonable Suspicion Testing
- A DOT-mandated drug or alcohol test triggered when a trained supervisor observes specific, documented signs of impairment in a driver.
- SAP (Substance Abuse Professional)
- A licensed clinician who evaluates drivers who have violated DOT drug or alcohol rules and determines the conditions under which they may return to safety-sensitive duty.
- CSA Score (Compliance, Safety, Accountability)
- An FMCSA rating that scores carriers and drivers across seven safety categories using roadside inspection data, crash reports, and investigation results.