The day when conventional combustion engines, gasoline and the likes, have been replaced with electric? High performance even!
What will traffic sound like? What will a day at the races sound like? What will the Indy 500 sound like, or maybe NASCAR??
It may not be in my lifetime... or ever, but it is a possibility. I'm not looking for politics, I'm just asking to use your imagination and describe what some events might sound like minus the 'auto' sound. Good or Bad... just curious.