self driving cars which negotiate a uniform speed.

Until then, human drivers could approximate this system by all agreeing on a uniform speed. Maybe through some sort of app?

Or, this sounds crazy, perhaps the authorities could post signs by the side of the highway with the uniform speed printed on it?

This is why we need to ban cars. I’ve been delayed so many times by cars, and maybe once in my life by a protest. Emergency service response times get vastly better with fewer cars. It’s been proved over and over, like in New York recently.