Your quiet hybrid is likely to make itself heard in the not-so-distant future

Under a new safety regulation issued by the federal government, hybrids and electric cars will be equipped with a device that emits sound to alert passersby that the vehicle is running. Manufacturers have until Sept. 1, 2019, to meet the requirement.

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http://www.accessibilitynewsinternational.com/your-quiet-hybrid-is-likely-to-make-itself-heard-in-the-not-so-distant-future/