In what order will the cars pass through the intersection if the police car (C) is travelling without its beacons or siren switched on?

Explanation

With no special signals on, the police car (C) is an ordinary road user. This is an uncontrolled junction of equal-rank roads, so the right-hand rule applies. The police car (C) goes first — nothing is on its right. Then the blue car (B) goes, since the obstacle on its right, the police car (C), has already passed. The red car (A) waits for the blue one, which is on its right, so the red car (A) goes last.