It has passed a bill to ensure that the vehicles make enough noise to be heard by visually impaired people about to cross a street.
The measure would establish a committee to study the issue and recommend ways the vehicles could make more noise.
The state Department of Motor Vehicles says more than 300,000 of the vehicles are on state roads. Officials say they don't keep statistics on pedestrian accidents involving those vehicles.
The bill has been sent to Gov. Arnold Schwarzenegger, who has not taken a position.
