It always cracks me up when someone mentions "the 101" and then someone else would immediately respond "found the Southern Californian!" I thought this phrasing of "invaders" was a real gem.
Yea that was funny - the reason socal people say "the" before freeways is that for a long time many of them were officially labeled things like "the San Diego Freeway" (along with a number). So it just fell into place after that.