A door alert is the biggest offender of guest caused problems. Too much pressure on the doors, or sometimes guests even try to open the escape hatches. This will bring the train to a complete stop and the driver will be fully aware of what's going on. To remedy this a physical bypass has to be used and held until the train has entered a station. All the while the driver is responsible for keeping an eye on the doors and hatches of the train to make sure nothing becomes completely open, or a guest doesn't try to jump out. With a driver in place this problem is remedied in a matter of minutes most of the time. If the train was fully automated this would require the train to be evacuated before it could safely be moved.