From my understanding, this is required of nearly all &#x27;self-driving cars&#x27;. A Slate article from 2014 stated that Google&#x27;s cars wouldn&#x27;t know a stoplight existed, and would simply run it, if it wasn&#x27;t in Google Maps. And that a Google engineer said the level of mapping required by their cars at the time would be &#x27;impractical&#x27; to do at a nationwide level.<p>These cars require a lot more detail than traditional Google Maps data provides. And there&#x27;s a huge concern about how they&#x27;d adapt to changes in the roadway which may have not made it to Google&#x27;s servers yet.