CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER V—NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 501–599) > PART 585—PHASE-IN REPORTING REQUIREMENTS > SUBPART L—Roof Crush Resistance Phase-in Reporting Requirements (§585.111 to §585.117) > 585.112—Purpose.