A proposed law in California that would have mandated all new cars sold in the state to emit audible alerts when drivers exceed the speed limit by more than 10 miles per hour has been vetoed by Governor Gavin Newsom. The legislation, designed to curb speeding and reduce traffic fatalities, aimed to make California the first state to enforce such a regulation. If enacted, starting from 2030, all new cars, trucks, and buses sold in California would have been required to include this software, with the exception of motorcycles, scooters, and emergency vehicles.

The European Union already has a comparable anti-speeding measure in effect. As of 2024, all new cars sold in the EU must produce an audible beeping sound whenever the vehicle exceeds the speed limit. This feature can be disabled by the occupants but reactivates each time the car is started.

In his statement, Governor Newsom cited concerns about undermining the federal framework established by the National Highway Traffic Safety Administration (NHTSA). He noted that the NHTSA is currently evaluating intelligent speed assistance systems and that imposing state-level mandates could disrupt these ongoing federal assessments. Although the NHTSA has not yet implemented speed-limiting software, it has introduced new regulations requiring automatic emergency braking on all new passenger vehicles starting in 2029.

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