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For those who may be interested in hearing it, this is a link to a YouTube video that demonstrates the new warning noise made by the 2013 RX450H. It's called the Vehicle Proximity Notification System and the noise is made when the car would have been moving silently in previous models.
It's a safety feature designed to warn pedestrians and cyclists about the presence of the car.
I don't care for the noise, but I'll let you be the judge.