My understanding of Verizon's original throttling plan was to throttle you on the particular tower in which you were using the majority of your data. (Until your next billing cycle) So in your case, (since you're traveling), your usage is spread out across multiple towers, in which case you're not putting up any "red flags" so to speak.
In my case, the majority of my usage is at home or work.
(We should probably move this discussion to the Verizon unlimited thread, being that we've completely derailed the OP) lol
S5 tap'n