Is a driver permitted to overtake a vehicle that has operational blue (or blue and red) flashing beacons and an active siren escorting a motorcade?

1. Yes, if the overtaking can be completed below the speed limit.
2. No, overtaking such vehicles and the motorcade they accompany is strictly prohibited.
3. Yes, provided the driver sounds their horn first.
4. Yes, but only on multi-lane motorways.