What does a supplementary green arrow (dopunska zelena strelica) illuminated alongside a red main traffic light indicate?

1. Drivers may turn in the direction of the arrow, but must yield priority to all pedestrians crossing and vehicles moving on the cross-street
2. Drivers have absolute right-of-way to turn in the arrow's direction without looking
3. The traffic light has failed and all four-way traffic must stop
4. Only public transport buses are allowed to turn