Section 550.

Cal. Vehicle Code - VEH § 550.
in effect
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A “semitrailer” is a vehicle designed for carrying persons or property, used in conjunction with a motor vehicle, and so constructed that some part of its weight and that of its load rests upon, or is carried by, another vehicle.
Source: CA Legislative Counsel Bulk DataURL: https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zipFetched: 6/27/2026

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