Who has to indicate in this situation?

In this scenario, both you and the blue car are required to indicate your intentions. According to German traffic rules, drivers must signal when they are changing direction or lanes to inform other road users of their intended actions.

The reasoning behind this requirement is to ensure safety on the road and to enhance communication between drivers. When both vehicles use indicators, it reduces the risk of accidents by allowing other drivers and pedestrians to anticipate movements.

It's important to understand that indicating correctly is not just a matter of following a rule; it's about fostering a safer driving environment for everyone.