You can't tell from reading the fare rules.

The only way you can tell would be to compare the fares of each individual segment. Also, where the ticket is and where stopovers are taken also determine whether a HIP applies.

For example:

BKK-HKG-LAX First Class

Fares for each component (the fares presented below are hypothetical):

BKK-HKG $5xx
BKK-LAX $2xxx
HKG-LAX $4xxx

(HKG would the the HIP in the above example)

If ticketed in Thailand (SITI):

1) BKK X/HKG LAX $2xxx
2) BKK HKG LAX $4xxx

If ticketed outside Thailand (SOTO): (This is the reason why no matter how hard you try on travelocity.com, you will never be able to get the chaper ex-BKK fare)

1) BKK X/HKG LAX $4xxx
2) BKK HKG LAX $4xxx


Sometimes the computer systems might overlook the HIP issue (and price using the low fare) as there might not be a fare basis with SIMILAR CHARACTERISTICS in another city pair to compare with. This seems to only happen with the fare is a restricted fare with special conditions. (This is why travelocity.com can price cheap ex-LIS BA "A" class fares [don't know if they fixed this hole yet] even if tickteted outside Portugal). It seems like the way to fix this problem would be to publish higher "A" fares ex-LHR (HIP) with SIMILAR CHARACTERISTICS for the reason of "comparing".