As someone nearly deaf, a few things come to mind: * Can I hear this white noise thing? I can hear the typical backup beep up close. They're annoyingly loud

As someone nearly deaf, a few things come to mind: * Can I hear this white noise thing? I can hear the typical backup beep up close. They're annoyingly loud for people like me. In theory white noise might be audible to more people with partial frequency losses. I don't know in practice. * Audible measures should never be a sole indicator of danger. Why isn't there a flashing light? * I can't hear electric cars at low speed at all.