§ 20-135.4. Certain automobile safety standards. (a) Definitions. – For the purposes of this section, the term "private passenger automobile" shall mean a four-wheeled motor vehicle designed principally for carrying passengers, for use on public roads and highways, except a multipurpose passenger vehicle which is constructed either on a truck chassis or with special features for occasional off-road operation. (b), (c) Repealed by Session Laws 1975, c. 856. (d) The manufacturer's specified height of any passenger motor vehicle shall not be elevated or lowered, either in front or back, more than six inches by modification, alteration, or change of the physical structure of said vehicle without prior written approval of the Commissioner of Motor Vehicles. On or after January 1, 1975, no self-propelled passenger vehicle that has been so altered, modified or changed shall be operated upon any highway or public vehicular area without the