NHTSA's new laboratory test procedure for determining the number designated seating positions in a row (TP-DSP-00) was published February 27, 2009 and is available online by clicking here. The DSP definition is provided in Title 49, of the Code of Federal Regulation, Part 571.3 (49 CRF 571.3). The definition is not a Federal motor vehicle safety standard (FMVSS), but the term DSP is used in other FMVSSs. NHTSA amended the definition for DSPs through a final rule (73 FR 58887) issued on October 8, 2008. The revised definition becomes effective on September 1, 2010.
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