warning from vehicle with transitional superiority

What vehicle driver must have an audible or visible sign of a vehicle with transitional superiority?

1- Escorting an ambulance

2- To make room on the road

3- At an intersection, immediately release the junction

4-  2+3


The right answer is: 4-  2+3    2- To make room on the road + 3- At an intersection, immediately release the junction