Final answer:
A Carrier Safety Rating is based on an operator's safety record, which includes collisions and convictions, inspections, and facility audits.
Step-by-step explanation:
A Carrier Safety Rating is based on an operator's safety record, which includes collisions and convictions, inspections, and facility audits. Collisions and convictions refer to any accidents or legal convictions involving the operator, inspections are conducted to assess the safety of the vehicles, and facility audits evaluate the overall safety protocols and practices of the operator.