You are in the driver's seat of a large bus in the middle of a busy city. The bus is full of passengers and you need to get them to their destination. But first, you have to make sure that the road is clear and that there are no accidents or roadblocks. 

Drive carefully and make sure that you keep the bus on the road. You have to pick up passengers and drop them off at their destination. But be careful and make sure that you don't hit any obstacles. If you do, then you will have to start all over again.