The concept of providing free passage is described in Section 10 of the Traffic Regulations.

You must not obstruct and if necessary, come to a complete stop for:

Emergency vehicles with flashing blue lights

Trams and trains

Groups of pedestrians under the supervision of a leader, processions, funeral processions, military vehicle convoys, or civil defense convoys. Groups of pedestrians under the supervision of a leader, processions, funeral processions, military vehicle convoys, or civil defense convoys.