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The purpose of this hearing was to conduct a regulatory review of the general certification requirements and procedures for light - and medium-duty vehicles and to establish interim reactivity adjustment factors for the fuels and emission categories not previously established by the Board . The team 's goal for Year 3 is to have a working BAS system so that engine can be shut off when it is not required for propelling the vehicle and to have the engine running HEDGE so that we can win the emissions event . On major challenges : We need to speed up development of the crew exploration vehicle and to complete the space station and retire the shuttle in an orderly manner . Beneath the media firestorm lurked another , potentially bigger , problem : the growing reliance on Guard and Army Reserve troops to drive and protect those transport vehicles and to do almost everything else required to support active-duty combat forces abroad . A clarifying provision is included to ensure that states may continue to regulate safety with respect to motor vehicles and to impose highway route controls or limitations based on the size or weight of the motor vehicle or with regard to minimum amounts of financial responsibility relating to insurance requirements . Subsection ( b ) directs the Secretary to review potential safety benefits of the use of non-sedating antihistamines by operators of commercial vehicles and to consider encouraging the use of such antihistamines .