; and (B) far-side impacts, in which the child restraint system being tested is positioned on the opposite side of the point of impact. (3) Booster seat test devices (A) Design Not later than 18 months after the date of the enactment of this section, the Administrator shall issue regulations that provide guidelines for a test dummy that approximates a 6-year-old child for the purposes of side-impact crash testing. (B) Use Not later than 18 months after the date on which the Administrator issues regulations under subparagraph (A), the Administrator shall require that side-impact crash testing for booster seats (for both near-side and far-side impacts) includes the use of a test dummy that meets the guidelines provided under subparagraph (A). (c) Tether systems study Not later than 1 year after the date of the enactment of this section, the Administrator shall provide to Congress a study of the functionality of tether systems and the variability that exists in tether use recommendations by car seat and vehicle manufacturers, with recommendations on how such tether systems may be used or modified to increase the usage of child restraint systems with internal harness to maximize child safety. (d) Definitions In this section: (1) Administrator The term Administrator means the Administrator of the National Highway Traffic Safety Administration. (2) Booster seat The term booster seat has the meaning given such term in section 571.213 of title 49, Code of Federal Regulations (as in effect on the date of the enactment of this section). (3) Child restraint system The term child restraint system has the meaning given such term in section 571.213 of title 49, Code of Federal Regulations (as in effect on the date of the enactment of this section). (4) Child restraint system with internal harness The term child restraint system with internal harness means a child restraint system designed to be used rear-facing or forward-facing employing a 5-point harness to position the child in the seat. (5) Combination car seat The term