I don't know if that works in the EU but in the US most places are not a city and most places whilst technically walkable the kids will have to start walking at 4am and maybe they will get to school on time after walking along rural highways and on dirt roads. That would be incredibly dangerous, reckless and irresponsible.

As for tracking, I want more of it by individuals just not centralized corporations. The porch pirate bosses often park in front of my place to watch their minions of whom snatch packages around the time that kids are getting home. Some of the porch pirate minions drive vans and could easily snatch kids. I have been encouraging many of the people in my area to install cameras that log license plates and catch faces and vehicles in multiple directions of their roads and highways. We've removed some of the organized crime and pushed some of it out of this area and we will continue to push harder.