What does it mean when the flashing blue light of a vehicle is switched on but not the siren?

The selected combination is correct because when a vehicle has its flashing blue light activated but is not using its siren, it indicates that the vehicle is responding to an emergency situation. Specifically, option 1 signifies a warning of an accident or other dangers, which is crucial for other road users to be aware of potential hazards. Option 2 indicates that a fire brigade is in action, alerting drivers to yield the right of way.

In German traffic rules, specifically under the Straßenverkehrs-Ordnung (StVO), the use of a blue light without a siren signifies that the emergency vehicle is in a non-urgency mode but still requires attention from other road users. Understanding this helps ensure that appropriate precautions are taken to ensure safety on the road. Selecting only one of the options would omit important information regarding the nature of emergencies, which could lead to misunderstandings in traffic situations.