What should you do when you see flashing blue lights and a siren?

When is it an emergency vehicle?A motor vehicle from the police, fire service, or ambulance that is using the prescribed blue flashing lights and siren is an emergency vehicle. Road users must give way to such a vehicle.

Here’s how to react safelyStay calm and check your mirrors and surroundings.
Try to work out where the vehicle is heading.
Make room gradually without putting others in danger.
Do not brake sharply or block an intersection.
Follow instructions from police or traffic controllers.
There is no single maneuver that is always right. Sometimes moving aside is the best choice; sometimes you should keep driving briefly to create space. Safety and predictability come first.

Exam tipIf needed, say out loud that you have seen the emergency vehicle and are first looking for a safe place to move. This shows that you are acting deliberately rather than in panic.

See the RVV 1990 at the official source.