How is the “Top 30%” OOS, Hazmat violations, and crash ratings calculated?
The “top 30%” is a factor defined by examining ALL motor carriers registered for a USDOT Number. The factor establishes a threshold where in the total population of motor carriers, 30% of them fall above the number for out-of-service rates and crashes. The “top 30%” threshold would be numerical values that will be published on the FMCSA Web site for motor carriers to determine their ability to transport permitted HM. The national crash rate for the motor carriers that transport HM is determined by using motor carriers with two or more crashes reflected in FMCSA’s system. A motor carrier would determine its crash rate as the number of crashes divided by the number of power units. The simple formula would be expressed as follows: HM Permitted Motor Carrier crash rate = Number of crashes in the past 365 days / total number of power units (operating). The out-of-service and crash rates will be recalculated every 24 months. Motor carriers that transport permitted HM will obtain their out-of
