Collision avoidance is not a function of the transponder. ADS-B merely communicates the position of local traffic. ACAS is responsible for determining the vect

Collision avoidance is not a function of the transponder. ADS-B merely communicates the position of local traffic. ACAS is responsible for determining the vectors for the aircraft and the local targets. If there is a collision path calculated, ACAS then communicates with the target's ACAS to determine which way each aircraft is going to move. The pilot is then responsible for executing this action.