FMCSA once again is considering changes to its methodology for determining when a motor carrier is unfit. The advance notice of proposed rulemaking (ANPRM) comes more than six years after the agency withdrew a regulatory proposal to change the way it assigns carrier safety fitness determinations (SFDs). The ANPRM seeks comment on the need for rulemaking to revise the SFD regulations and seeks available science or technical information to analyze regulatory alternatives for determining SFDs.