And dramatically reducing crash survival rates.

Just need room temp super magnets so that the cars can "float" at a particular level of the magnetosphere. Don't worry Mlon Eusk is about five minutes away from personally cracking that physics problem and will be selling cars utilizing it for generational debt tomorrow./s

honestly even that is significantly too high anywhere near where people live, what i'd go with is a default limit of 30km/h and a 60km/h limit on motorways, which should be constructed more like railways are: sparingly and with safe crossings (ideally grade-separated).

30km/h is enough to go a pretty generous distance in an acceptable amount of time, certainly enough for even the sprawliest urban areas, and the motorways extend how far you can go in an acceptable amount of time without significant downsides.

This is largely what the netherlands does and it works well.

No chance Louis XVI would have given the people of France a decent standard of living either. Things change when enough people can no longer tolerate how they are or how they are going.

We can move the tubes more efficiently by making them large enough for many people, then chaining the various tub- hold up we invented trains again