On Tue, 31 Jul 2007 16:03:09 -0700, "Hilton" wrote
in :

Do you believe that there are times when 'see and avoid' has its limitations
and does not work?

There is little question that when the 250 knot speed restriction
below 10,000' is not followed, see-and-avoid is an unreasonable method
of separating aircraft:
http://www.ntsb.gov/NTSB/brief2.asp?...A028A &akey=1