Toyota Prius Vehicle Proximity Notification Noisemaker

With the number of electric and hybrid vehicles such as the Prius on the road increasing, concerns over the quietness of these vehicles have been building. Toyota has developed a sound to be projected by external speakers that rises and falls with vehicle speed, isn't masked by other environmental noise, and can be heard around obstacles and by individuals with some hearing loss. Here is an example of the noisemaker on the Prius v. It is standard on all 2012 Prius models.