<prompt> Translate the following text to EnglishSheria hiyo inatoa mfumo kuu wa udhibiti wa mpango wa kitaifa wa magari ya uzalishaji wa chini na inaunda njia ambazo wazalishaji wa magari na malori ya kazi nyepesi wanaweza kujitolea kufuata viwango vya bomba la kutolea nje ambazo ni kali zaidi kuliko EPA inaweza kuamuru kwa wakati huu.  <response>: The rule provides the main regulatory framework for the National Low Emission Vehicle program and creates the means whereby automobile and light-duty truck manufacturers can volunteer to comply with tailpipe standards that are more strict than EPA can mandate at this time. 