This standard specifies performance requirements for the protection of vehicle occupants in crashes. Purpose. The purpose of this standard is to reduce the number of deaths of vehicle occupants@ and the severity of injuries@ by specifying vehicle crashworthiness requirements in terms of forces and accelerations measured on anthropomorphic dummies in test crashes@ and by specifying equipment requirements for active and passive restraint systems. Application. (a) This standard applies to passenger cars@ multipurpose passenger vehicles@ trucks@ and buses. In addition@ S9@ Pressure vessels and explosive devices@ applies to vessels designed to contain a pressurized fluid or gas@ and to explosive devices@ for use in the above types of motor vehicles as part of a system designed to provide protection to occupants in the event of a crash. (b) Notwithstanding any language to the contrary@ any vehicle manufactured after March 19@ 1997@ and before September 1@ 2006@ that is subject to a dynamic crash test requirement conducted with unbelted dummies may meet the requirements specified in S5.1.2(a)(1)@ S5.1.2(a)(2)@ or S13 instead of the applicable unbelted requirement@ unless the vehicle is certified to meet the requirements specified in S14.5@ S15@ S17@ S19@ S21@ S23@ and S25. (c) For vehicles which are certified to meet the requirements specified in S13 instead of the otherwise applicable dynamic crash test requirement conducted with unbelted dummies@ compliance with S13 shall@ for purposes of Standards No. 201@ 203 and 209@ be deemed as compliance with the unbelted frontal barrier requirements of S5.1.2.