Comment by bobthepanda

11 days ago

Before the current wave of automation there was a previous technology to automate buses using optical sensing and lines in the road which had the same issue.

If you want rails: build rails.

  • There are entire subway systems built with tire-on-concrete where the trains ride precisely the same routes down to the millimeter. Montreal’s is a famous one. These systems are not as efficient as rail, but they are quieter and gentler than the typical subway.

    • The problem is that the optical guided bus was built with the intention of reducing cost, since painting lines is a lot cheaper than building rails.

      The moment you have to build rail-like things you lose most of the cost advantages.

    • That's still rail. It's just not steel-on-steel.

      Otherwise you'd have to seriously limit what systems you call "monorail".