Maybe give cars a second pair of axles, to keep them aligned with the overhead power on the highway and to reduce the tire wear. Maybe join them together too so each individual car doesn’t have to worry about braking and the driver can basically just sleep.

This isn’t me sarcastically reinventing trains. I see why people would rather spend their commute in a private car than in a public train carriage. These features just seem genuinely useful.

What I have sarcastically reinvented is basically just self-driving cars.