PHMSA assist FHWA to improve performance of the rollover protection devices on bulk liquid cargo tanks by: Phasing out from HM service the use of all cargo tanks that fail to meet new performance standards promulgated in response to Safety Recommendation H-92-4.
A study was prepared by the University of Michigan Transportation Research Institute outlining the results of a study to investigate and analyze the forces of energy involved in rollover crashes. PHMSA, in cooperation with FMCSA published an ANPRM in the Federal Register 11/16/99 to solicit comments on the validity of the study and solicit ideas about formulating performance-based roller protection regulations.
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