What is the purpose of the "special signal" before entering a bank branch?

The purpose of the "special signal" before entering a bank branch is to signal if it's safe to enter. This practice is particularly important for maintaining security and ensuring the safety of both customers and bank employees. The signal may indicate situations such as whether the bank is open, whether there are any security concerns, or if it is safe for customers to enter without risk. Effective communication of safety through this signal helps create a secure banking environment, allowing customers to trust that they can safely conduct their transactions.

In contrast, options that suggest alerting customers of promotions or indicating bank hours do not address the immediate safety concern that the special signal is designed for. Similarly, providing directions to services is not relevant to the main function of ensuring safety at the entrance.