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SUMMARY: This document responds to two petitions for reconsideration of a May 12, 2009 final rule that upgraded the agency's safety standard on roof crush resistance. The first petition requested the agency to reconsider its decision to apply a lower roof strengthto- weight ratio requirement to heavier light vehicles, i.e., ones with a gross vehicle weight rating greater than 2,722 kilograms (6,000 pounds), than to other light vehicles. The second requested reconsideration of that decision as well as the agency's decision not to adopt a dynamic rollover test requirement as part of this rulemaking. After carefully considering the petitions, we are denying them. This document also responds to supplemental requests made by the petitioners.