[danpat]

Volvo proposed embedding small permanent magnets in the road surface that would allow vehicles to track more reliably.

Their press-release for it is here, and has a couple of minor technical details:

https://www.media.volvocars.com/global/en-gb/media/pressrele...

I kind of liked the idea - it's basically a higher-tech line-following robot concept, and doesn't look too expensive to roll out compare to other proposed infrastructure changes.

However, I haven't heard anything about it since the 2014 press frenzy over the release linked above. Maybe getting road maintainers to make changes like this really is too much to ask.

[slavik81]

When I first saw magnetic markers proposed, it was sometime between 1999 and 2005.