Activating "CPU control" on a created bus means the bus will be taken by a colleague, who will drive it either accordingly on the roadmap or - if the bus has no schedule or else - back to the depot.
If the bus is controlled by a colleague and he is not gone away, you can put yourself in any perspective available on the bus and watch him. Sometimes it is even enjoyable for the most veteran bus driver to not even keep the wheel in his hands, but to enjoy. Last but not least you get to know foreign routes.
Please activate CPU control for the focused bus now.