Because they are validated extensively inside that geofence and any operations inside that area are "supported". They don't let the vehicles go anywhere they wa

Because they are validated extensively inside that geofence and any operations inside that area are "supported". They don't let the vehicles go anywhere they want and they don't ever allow you to use it in an unsupported manner. You want a Waymo stop right in the middle of a busy intersection? The vehicle will refuse and keep going until it finds a safe place to stop.