To all those confused by the explanation - the shown speed limit includes the rotation of the Earth as well.
And that's what I'm getting at, maybe these so-called "alien invasions," are a result of disgruntled vacationers unhappy with the discrepancies from their travel brochures. Instead of meeting them with tanks, we should be exercising the gracious hospitality that any gracious host would be expected to! There may be much fewer instances that have the aliens running for their laser-gun compartments.
Bonus points for anyone that can correctly guess the general vicinity that the shown speed limit was calculated for.