That is actually a thing, but the optimal speed depends on traffic. Otherwise it always helps to lower speed limits, there are several studies in my area which show that on average everybody would arrive quicker at their destination if we reduce urban speed limit from 50 to 30 km/h.

It exists… Only in movies and games though;)

I was always dreaming about some kind of “individual public transport” (I think minority report had a nice example, because there the transport is part of your flat and thus doesn’t waste space when not moving), which interconnects into trains for longer distances. Currently it would probably be only freezable for Intercity ranges, otherwise the coupling process takes longer than the drive.

Also, you can charge electric cars through induction rings in the street, like mobile phones. The efficiency is not the best though.

Geez… I didn’t want to write an entire essay and just mentioned ONE possible example for improvement, to illustrate my explanation. No need to get salty…

He might be commuting

Similar to https://en.m.wikipedia.org/wiki/Turbulence The gist of it is that once you reach critical density people can not drive homogenously anymore and (de-) accelerate constantly to not bump into the next car. The problem could be alleviated with self driving cars which negotiate a uniform speed.

Catholics: Praying for prey, every day.