If the doors are not properly closed, what will happen according to the operator's indication?

When the doors are not properly closed, the system is designed to provide a clear indicator to the train operator. Specifically, the indication that the side doors are open allows the operator to be aware of the potential safety hazard. This is critical in ensuring the safety of passengers as the train cannot depart with open doors. By providing this indication, operators are alerted to check and secure the doors before the train proceeds, preventing any accidents or incidents that could occur from the train moving with doors ajar. This safety protocol helps maintain a controlled environment both for passengers and the train's operation.