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FMCSA withdraws its notice of proposed rulemaking (NPRM), which proposed a revised methodology for issuance of a safety fitness determination (SFD) for motor carriers. The new methodology would have determined when a motor carrier is not fit to operate commercial motor vehicles in or affecting interstate commerce based on the carrier's on-road safety data; an investigation; or a combination of on-road safety data and investigation information. However, after reviewing the record in this matter, FMCSA withdraws the NPRM. The Agency must receive the Correlation Study from the National Academies of Science, as required by the Fixing America's Surface Transportation Act, assess whether and, if so, what corrective actions are advisable, and complete additional analysis before determining whether further rulemaking action is necessary to revise the SFD process.