Re: If you are going to describe a future, make it aspirational.
""Cars on autopilot can entrain with other autopilotted cars going in the same direction."
IIRC this was envisaged and trialled on closed test tracks at least 30 years ago."
Yep, that's about right. I just learned it's called "platooning". A special section of Interstate15 was set up to allow about 20 specially equipped cars, buses and trucks to drive all together down the road. The project started in 1991, funded by USDOT, cancelled in 1999. And I got to watch Red Whittaker's (CMU Robotics Institute) huge van drive around the park in Pittsburgh in 1989-1991 time period, completely autonomously - at a slow walking speed. Back then it took 15,000 lbs. of sensors, cameras, and computers packed into an overloaded box truck, along with generators and air conditioners.