미국 내의 각종 교통사고를 조사하고 안전 권고안을 제시하는 독립적인 정부 기관.
An independent U.S. government investigative agency responsible for civil transportation accident investigation.
예문:
"The NTSB is investigating the recent train derailment to determine if human error was involved."
"The NTSB recommended new safety protocols for commercial airlines following the incident."