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

The flashing blue light signifies an emergency vehicle, which can include police, fire brigade, or ambulance services. When the blue light is on without a siren, it serves as a warning for specific situations.

Choice 1, "Warning of an accident or other dangers," is correct because the blue light alerts other road users to potential hazards ahead due to an ongoing incident, ensuring safety and smooth traffic flow.

Choice 2, "Warning of fire-brigade in action," is also accurate as it indicates that a fire brigade is responding to an incident, requiring other vehicles to yield the right of way.

Choice 3, "A breakdown vehicle is on duty and on its way to its destination," is not correct in this context. While breakdown vehicles can display blue lights, typically they also use other signals or colors to distinguish themselves clearly.

Thus, the correct combination includes 1 and 2, as they reflect the primary meanings of the flashing blue light in emergency situations according to German traffic regulations. Understanding these distinctions is crucial for safe navigation on the road when encountering emergency vehicles.