It's inevitable that roads will eventually be built with electronic assists. However, there are good reasons to develop cars that can still drive without them.

It's inevitable that roads will eventually be built with electronic assists. However, there are good reasons to develop cars that can still drive without them. Given that the government would have to do it, it's going to be a really long time to completely retrofit our roads with these devices. We're still not putting them into new roads right now, nor am I aware of any international standard for doing so. A common standardised database of road works would have been useful for decades of GPS navigation but we still don't have that either - most countries don't have one at all, and the ones that do aren't standard (often even varying from city to city) and tend to be incomplete. Relying on the governments of the world to sort this out is a risky strategy. Secondly, even assuming we do get these systems in place, you can bet good money they will frequently be wrong. Some contractor will come and dig up the road but forget to move/disable/update the electronic markers. So having a parallel visual self driving system to help identify these situations is essential. Third, pedestrians, bicycles, kids, animals, etc. are unlikely to contain these markers. For trains, we just ban them from the track, put fences around it, etc. but that's clearly not going to work for most roads.