Section 24008 Of Chapter 1. General Provisions From California Vehicle Code >> Division 12. >> Chapter 1.

. It is unlawful to operate any passenger vehicle, or commercial vehicle under 6,000 pounds, which has been modified from the original design so that any portion of the vehicle, other than the wheels, has less clearance from the surface of a level roadway than the clearance between the roadway and the lowermost portion of any rim of any wheel in contact with the roadway.