Section 225.

Cal. Vehicle Code - VEH § 225.
in effect
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An “auxiliary dolly” is a vehicle, not designed for carrying persons or property on its own structure, which is so constructed and used in conjunction with a semitrailer as to support a portion of the weight of the semitrailer and any load thereon, but not permanently attached to the semitrailer, although a part of the weight of such dolly may rest on another vehicle.
Source: CA Legislative Counsel Bulk DataURL: https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zipFetched: 6/27/2026

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