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

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/pressreleases/140760/volvo-car-group-tests-road-magnets-for-accurate-positioning-of-self-driving-cars 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.