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Reminds me, 10 years back, battery cars suddenly seemed so much silent, that they added engine noise played on speaker to alert pedestrians.

• Someone 5y ago
  In both the USA and the EU, that’s more or less (doesn’t have to be engine sounds, I think, but sounds are required) by law. See https://en.wikipedia.org/wiki/Electric_vehicle_warning_sounds https://en.wikipedia.org/wiki/Electric_vehicle_warning_sound....
• alisonkisk 5y ago
  "suddenly" was because that's when they started existing in noticeable numbers.
  • kube-system 5y ago
    No, it's because vehicles before then were not required to meet minimum sound requirements by law. Check the spec sheets of HEV/PHEV/EV vehicles made before then -- they don't have acoustic alerting systems. Now they all do (in the jurisdictions that require it).
    • CaptainMarvel 5y ago
      The law didn’t exist until there were enough electric cars to care about this. The cause and effect starts with the number of quiet cars.
      • kube-system 5y ago
        Yes, but it wasn’t their mere existence that caused automakers to add noise. People who buy these vehicles like that they are quiet. The noise generators were added only because regulatory action was taken.