TCAS Ⅱ is likely the end of the line for collision avoidance technology. TCAS Ⅲ would have added horizontal maneuvers to assist aircraft near the ground or at their service ceilings. TCAS Ⅲ proved insufficiently accurate using then-available technology. TCAS IV would have used GPS to provide reliable position. That set it up on a no-win collision course with ADS-B's TIS-B, and that effort too has been dropped. That's how tech is—one leapfrogs another. But see-and-avoid is eternal, and remains our first, best line of defense.
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