In ARPA, you will get an alarm if target swap has occurred.

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In ARPA, keeping track identities straight is a key part of how the system operates, but there isn’t a dedicated automatic alarm for a target swap. A target swap is when two tracked targets unintentionally exchange the displayed identities, usually due to close proximity, similar movements, or brief ambiguities in the tracking data. The ARPA system relies on automatic correlation to maintain track identities, but it won’t trigger a specific alarm for a swap event. When you suspect a swap, the correct approach is to verify and re-identify the targets manually, ensuring each track carries the correct identity and continuity.

So the statement isn’t correct because target swap isn’t signaled by a distinct ARPA alarm. It can occur in various traffic conditions and isn’t limited to high-traffic scenarios, nor is it something the system flags as a separate alarm.