An act to amend, repeal, and add Sections 27315, 27318, 27360.5, and 27363 of the Vehicle Code, relating to vehicles.
AB 435 revises California’s child passenger restraint laws to use the “5-Step test” as the standard for determining when a child, ward, or passenger is properly restrained by a safety belt. The bill amends Vehicle Code sections governing passenger vehicles, buses, and child restraint exemptions, and it repeals the current versions of those provisions effective January 1, 2027, replacing them with new operative language on that date. Under the new standard, a child is properly restrained only if they sit all the way back in the seat, their knees bend over the seat edge, the shoulder belt crosses the chest and shoulder correctly, the lap belt sits low on the thighs, and they can remain seated that way for the whole trip.
The bill affects several related provisions. It changes the definition of proper restraint for passengers 16 and older in vehicles and buses, and it updates the rule for children ages 8 through 15 so they may use a safety belt instead of a child passenger restraint system only if they meet the 5-Step test. It also revises the child passenger restraint exemption section for children under 8 who are at least 4 feet 9 inches tall, allowing them to use a safety belt if they meet the new definition. The bill preserves existing exceptions for medical conditions, emergency vehicles, certain work-related driving situations, and school buses, and it states that no state reimbursement is required for local costs associated with the new or changed infraction definitions.
The general sentiment reflected in the vote history was favorable, with the bill advancing through committees and floor votes by comfortable margins. It passed the Assembly and Senate stages with support from majorities, including some unanimous committee votes, indicating broad legislative acceptance of the safety-focused changes. The bill was chaptered by the Secretary of State on October 7, 2025, showing it ultimately became law.
The main point of policy contention appears to have been the bill’s expansion of the circumstances under which a violation can occur, because the Legislative Counsel’s Digest notes that changing the definition of “properly restrained” expands the scope of existing crimes and creates a state-mandated local program. That issue is reflected in the bill’s fiscal and local-program designations, though the bill also attempts to limit state reimbursement obligations. No committee transcript excerpts were provided, so the available record shows procedural support more clearly than substantive debate.
AB 435 amends Vehicle Code sections 27315, 27318, 27360.5, and 27363 to replace older seat belt fit definitions with the 5-Step test beginning January 1, 2027. This changes how law enforcement, courts, drivers, and parents determine compliance with California’s child passenger restraint and seat belt laws, especially for children old enough to transition from child restraint systems to seat belts. It also updates related bus passenger rules and preserves specified exemptions, while declaring that no reimbursement is required for local agencies or school districts because the measure changes the definition and scope of infractions.
The bill appears to have been viewed positively overall, with repeated committee and floor approvals and no recorded committee transcript opposition in the provided materials. Vote margins were generally strong, suggesting broad agreement with the bill’s child safety purpose and its alignment with existing seat belt enforcement policy. The final enactment as Chapter 434 indicates the measure had sufficient support to become law.
The principal area of contention is the bill’s legal effect: by redefining “properly restrained by a safety belt” to require the 5-Step test, AB 435 broadens the set of situations that can constitute a violation, which the digest identifies as expanding existing crimes and creating a state-mandated local program. That raises enforcement and local implementation concerns, even though the bill states no reimbursement is required. The bill also makes a policy choice to shift some children and passengers from the older belt-fit standard to a more specific safety benchmark, which could affect parents, drivers, bus operators, and local enforcement agencies.