Clearly now that we have brought our airspace into the 21st century, it is time to bring TCAS into the 21st century, too, and not have it give unnecessary advisories (whether TA or RA) if the aircraft aren't even going to be "close".
How about
:
TA - 1 NM/200 FT and provided 10 sec to CPA
RA - 0.3 NM/50 FT and provided 2 sec to CPA
At least RAs will only be associated with airproxs then.
