Kvmerunskie k03y, Ukraine

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From the traffic rules
The picture shows an intersection and 3 cars that collided head-on:
GBDD, UVO and DPS. All with flashing beacons and sirens on.(//tractor-service.com)
Question: which of the drivers broke the rules?
1. Only the driver of the DPS car.
2. The driver of the GBDD car.
3. The driver of the UVO car.
4. Nobody, the rules themselves are violated.