This is a joke correct? There is a lot of analysis done here when the relevant answer is they are numbered counting down the number of miles remaining going south towards it's termination in Los Angeles.
Heh. I see your point. I didn't stress enough on the fact that the patterns highlight a sparsity in the exits towards the north and such; I found the fact cool. I have added a tl; dr to make things better (hopefully). Anyways, appreciate you taking out the time to read it!