Assembly approves AB 1944 to delay axle weight limits for zero-emission buses
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Summary
The Assembly passed AB 1944 to postpone implementation of axle weight limits for zero-emission buses, citing slower-than-expected battery-weight improvements that threaten agencies' ability to procure vehicles with required range.
The California State Assembly passed AB 1944 on Jan. 20, 2026, a bill to postpone the implementation timeline of axle weight limits for zero-emission buses to give transit agencies more time to secure vehicles that meet range and weight needs. Assemblymember Lee presented the bill and said the declining weight schedule adopted in 2015 assumed faster battery-weight improvements than have occurred.
"This declining schedule was believed to provide sufficient time for advances in battery technology to reduce weight while maintaining high performance standards," Assemblymember Lee said, arguing that agencies are struggling to obtain buses that both meet weight limits and provide the range needed for longer routes. "AB 1944 provides a practical and responsible solution by postponing the implementation timeline of these axle weight limits to allow more time for battery technology advancements," Lee said.
The measure drew support from the California Transit Association, Lee said. The clerk opened the roll and the presiding officer announced the result and declared the measure passed.
Why it matters: The bill seeks to balance California’s zero-emission vehicle goals with transit agencies’ operational needs by providing additional time for manufacturers and battery technology to align with statutory weight schedules. Transit agencies have argued that current limits make it difficult to field battery-powered buses with adequate range on longer routes without exceeding axle-weight thresholds.
What the bill does: According to Lee’s floor presentation, AB 1944 postpones the next steps in the axle-weight reductions scheduled under prior law; it is framed as an authorization to adjust implementation timing so agencies can maintain reliable service while transitioning to zero-emission fleets. Supporters framed the change as temporary and technical; Lee stated the bill does not roll back California’s emission goals but addresses timing and feasibility.
Next steps: The Assembly voted to pass AB 1944 on the floor; the clerk recorded the vote and the measure was declared passed. The bill will proceed according to legislative process for further consideration as applicable.
