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I have ride in a Prius and it is so quiet that it is like riding in a electric golf buggy. http://en.wikipedia.org/wiki/Prius -------------- Quietness See also: Electric vehicle warning sounds The Wall Street Journal reported in February 2007 on concerns that quiet cars like the Prius may pose a safety risk to those who rely on engine noise to sense the presence or location of moving vehicles.[88] Blind pedestrians are a primary concern, and the National Federation of the Blind advocates audio emitters on hybrid vehicles,[89] but increased risks may also affect sighted pedestrians or bicyclists who are accustomed to aural cues from vehicles. However there is also a lack of aural cues from vehicles that have a conventional internal combustion engine, where engine noise has been reduced by noise-absorbing materials in the engine bay and noise-canceling muffler systems. In July 2007, a spokesman for Toyota said the company is aware of the issue and is studying options.[90] In the USA both state[91] and federal legislation[92] have been proposed, and the National Highway Traffic Safety Administration held a public hearing.[93] Different groups and companies are looking at solutions.[94][95] In 2010, Toyota released a device for the third-generation Prius meant to alert pedestrians of its proximity.[96] -------------