Personal Rapid Transit

Source: http://denver.streetsblog.org/2017/01/20/subways-and-pods-a-history-of-denver-transit-and-why-we-shouldnt-obsess-over-tech/

The future that could have been.  In the early 1970s, there was a proposal to build a personal rapid transit network in Denver.

What if, instead of light rail cars clanging alongside downtown traffic, Denver's trains burrowed underground? Or if, instead of trains, Denver had a network of tracks elevated on stilts throughout the city that flung personal pods from neighborhood to neighborhood like a kid's slot car racetrack? Unlike buses and trains, these pods could carry no more than 20 people at a time. They would have shuttled you directly to one of 40 or so stations, without stopping, along a 98-mile network high above Colorado Boulevard, Colfax Avenue, Sheridan Boulevard, Santa Fe Drive, Hampden Avenue, I-25, U.S. 36 and other corridors. Automated and driverless, many thought the system would have been an alluring technological coup for Denver at the time.
http://www.confluence-denver.com/features/denver_transit_history_011817.aspx

I wonder how these compare to self-driving cars?  Or to an elevated bus system.