Driver–vehicle association is essential to ensure that safety events and trip data are accurately attributed to the correct driver. 

A driver’s score is calculated only from trips where they are paired with a vehicle. Once paired, all trips from that vehicle are counted toward the driver’s score. Trips without a driver–vehicle pairing are excluded from scoring. 

• When a driver is mapped to a vehicle, all relevant safety events such as braking, speeding, acceleration, idling, cornering, and seatbelt violations are attributed directly to that driver’s score. 
• If no driver is mapped, certain events (such as seatbelt violations) are recorded at the vehicle level rather than being linked to an individual driver. 

This ensures that each driver’s score reflects their own driving behavior, maintaining fairness and accountability in performance evaluation.